I think it also makes a difference which model of Riedells you're switching from, and how stiff a boot you need. Are you doing single jumps or double jumps? Do you break boots down quickly?
I've been in SP Teri's for a long time and am about to move into my third pair of KT-2's. What I like about the KT-2 design is that it is a stiff boot, but the notch in the lace area allows you to bend your ankles in them so they aren't so hard to break in. The extra piece of leather (or plastic, if you get a stock boot) keeps them from creasing prematurely right by the notch. Best of both worlds, IMO. As for not being high/roomy enough in the toes, I don't think that should be a problem with the new heat-moldable boots because as long as they are wide enough and long enough, the shape will conform to the shape of your toes during heat-molding.
It sounds like you're getting customs. Would it be possible for you to give SP Teri your measurements over the phone and ask them to send you the closest size in stock boots so you could just try them on and tell them how close they are? I started with stock boots (size 6-1/2 B) and told them they were a little narrow in the front, a little big in the heel, and just a tad short in the length of the left boot. This information was probably more helpful to them than my measurements, because when I got my customs, they fit perfectly. People who just send in their measurements sometimes get a surprising variance in sizing (not only with SP Teris, but with other brands, too).