If I may chime in:
In all honesty the difference b/t the 52,54, and 60 are just about nothing. Maybe 25hp. They all have the same compressor wheel, just slightly different turbine wheels which are in the range of tv350s or something (pubic hairs smaller the P trim)
Thats why when people call me its either TE44 for stock converters, or TE60 if they are willing to go 2800-3000 stall. Some people in good weather can get away with less converter, but at altitude you are going to need more stall to get it to spool(3000).
We only install 44s, and 60s here at the shop(occational 51). SO many people think a 52 will be perfect, or maybe upgrade to a 54 in the future, then go 60 with the built motor. There's no difference! You might as well get the largest they sell for the $1595 price, b/c it wont spool up any different then even the 51. Upgrade to the 63 and you will see some noticeable differences, then after that you need to step up into the T or GT series wheels for 550+hp.
This is just my personal opinion from stuff we have worked on, so others might beg to differ. Keep in mind there are also many variables, so it is important to know your plan of attack ahead of time. If you only drive your truck on the street with 15psi your gonna want something different then if you were to race it frequently at 23psi.
