Hey Sower,
As you know I am working on a CRT conversion as well. I though I had my mind set on the Enerland 5s5000 pack, but I think I'm on the verge of switching to a MaxAmp 5s8000 pack. I chose a lower Kv wind (Neu in this case, but i claim no knowledge of which motor is better), with 5s over 4s. I did it because I too have hot summers and a fetish for cool gear. I figure with higher voltage I can gear down and have less current for the same power demands, and less current means less heat to dissipate. My last project I rotated through a bundle of motors trying to find the ideal, but voltage always gave me the best window to work within. Given the cost of packs, I'm going to employ the ole "it's better to have the voltage and not need it, then to need it and not have it" perspective in order to not blow 250-300$.
Also from eagletree data I am skeptical of ALL Lipo ratings. Given such, I'm thinking about choosing the 8Ah pack from Maxamp cause it fits nicely in my conversion and it actually has a lower CofG. Unfortunately, this is all a guestimation until the order comes in. Had to special order the smooth can Neu for the heat sink I posted in another thread.

Just my 2 cents.........