Nice poll idea, and thanks
@AngieNikodinovLove. It pays to look back and reflect on U.S. pairs history. In fact, several months ago, I did some research on North American pairs history and came up with some interesting facts, which I will share shortly.
I realize you offered a disclaimer, but then you probably should not say "of all time," because you left out several generations of U.S. pairs teams. Just to name a few:
Karol & Peter Kennedy (the first U.S. pair &
first ever North American pair to win gold at the World championships - 1950, plus they were 4-time World silver medalists, 5-time U.S. champions, and also won 2 U.S. silver medals);
JoJo Starbuck & Ken Shelley (3-time U.S. champions, 1 U.S. silver, 1 U.S. bronze, 1971 & 1972 World bronze medalists) who inspired and mentored Tai & Randy (5-time U.S. champions, 2-time U.S. silver medalists, 1977 & 1978 World bronze medalists, 1979 World champions, 1980 Olympians who were primed to vie for gold before Randy's injury);
Nancy & Ron Ludington (4-time U.S. champions, 1959 World bronze medalists, 1960 Olympic bronze medalists);
Watson/Oppegard (3-time U.S. champions, 1 U.S. silver medal, 1987 World bronze medalists, 1988 Olympic bronze medalists);
Mark and Melissa Militano were multiple U.S. medalists: 1 gold, 3 silver, 1 bronze (Melissa also skated with
Johnny Johns and won 2 U.S. championships);
Cynthia & Ronald Kauffman were 4-time U.S. champions, silver & bronze U.S. medalists, and 3-time World bronze medalists 1966-68;
Vivian & Ronald Joseph were U.S. champions in 1960, silver & bronze U.S. medalists, 1965 World silver medalists, and 1964 Olympic bronze medalists.
Another notable pairs team understandably missing from the list, but who were quite successful together were
Natasha Kuchiki & Todd Sand - they were paired prior to Meno/Sand shaking up U.S. figure skating with their decision to split from their partners and skate together. Kuchiki/Sand were U.S. champions in 1991, and they also had U.S. silver and bronze medals to go along with their World bronze medal won in 1991.
Of course, there are plenty of U.S. pairs champions we don't know much about, but they are still part of and crucial to U.S. pairs history. So it's a shame there's difficulty in accessing any memories or actual footage. Guess what:
Maribel Vinson skated pairs with two different partners: she was U.S. National pairs champion with
Thornton Coolidge in 1928 and 1929; then she paired with
George Hill and won 3 U.S. silver medals (1930-32) & 4 U.S. gold medals (1933, 1935-37). Vinson did not break through at Worlds or Olympics as a pairs skater with either of her partners. But of course, she had stellar success in singles winning Olympic bronze in 1932, World silver in 1928, and World bronze in 1930, to go along with her record 9 U.S. ladies championship medals, plus a bronze and a silver in ladies at Nationals. We never hear anything about Maribel Vinson's pairs exploits.
Since you only go back to the 1970s with your poll, you should probably say 'Best U.S. pairs of the past 50 years.'
I had a difficult time choosing just three teams on your list. I considered Kristi and Rudy who were very good, but they did not stay together long enough to achieve more than 2 U.S. championships and they placed as high as fifth at Worlds two years in a row (1989-90). Urbanski & Marval were 2-time U.S. champions, and they have a U.S. silver medal, but they also did not break through at Worlds or the Olympics, despite being exciting to watch. I think Ina & Dungjen were good together, but Ina/Zimmerman ended up being better. Jenni & Todd had guts for breaking up successful partnerships in order to skate together. And Jenni/Todd achieved a lot: 3-time U.S. champions, 2 U.S. silver medals, 1 World silver medal, 2-time World bronze medalists, in addition to U.S. medals with other partners (& Todd's World bronze with Kuchiki).
IMHO, aside from 3-axel record set by Inoue/Baldwin, Scimeca/Knierim's boffo 4-twist, and McLaughlin/Brubaker's stunning couple of seasons without fulfilling their potential, those teams don't quite seem to belong on a
greatest of all time U.S. pairs list. Castelli/Shnapir even less so. If those teams are included, then you way overlooked Evora/Ladwig, Hinzmann/Parchem, Marley/Brubaker, Denney/Coughlin, Yankowskas/Coughlin, et al. And obviously, under the circumstances, the Carruthers surely would seem to deserve more than one vote in this poll as 4-time U.S. champions, U.S. silver medalists, 1984 Olympic silver medalists, 1982 World bronze medalists.
The poll is obviously based more on recent memories than it is on actual achievements. Hopefully, I made no mistakes in reciting these stats.
All things considered, and based on the options on your list, I had to go with Tai/Randy, Jenni/Todd, Ina/Zimmerman (the last U.S. pair to be on the World podium - 2002).
Every pairs team included in the poll, were in their own unique way, fabulous! 
