advice on 4l60e builder... PLS Help! must buy soon

[newby]

been looking at these two transmissions:

http://performabuilt.com/
level 2

or

http://www.transperformance.net/4l60e%20LEVEL%203.html
level 3

anyone used either of these guys? the transperformace stage 3 reads the same as the performabuilt stage 3, but costs as much as their stage 2.

i've gotta make a decision by the end of this week

thanks