What motor esc setup are you going to be using with these? Because 3200 mah at 20C, means you can only get a max 64 amps out of those batteries which is not a lot for some of the very fast modified motors out there today. Using a very fast motor will probably cause the batteries to heat up considerably, not to mention they might not give you enough current to power the motor properly (thus reducing performance). Lipos are quite an investment and you don't want to be re-investing just because you don't get enough power for your racing needs.
Just as a comparison, I ran (for the first time) my B44 with 5500 mah Lipos (15C) and a Mamba max 6900 kv motor. The motor is very powerfull, but the batteries were delivering plenty of power and satyed nice and cool. Some others at the track were running smaller packs (2500-3000 mah) and they were getting very hot (some even swelling!). Not good.
Anyways, it's just food for thought! Buying a bigger Lipo not only gives you longer run times, but more power to the motor.
Hope this helps!
CODMAN