Tranny upgrade 02 Tahoe w/Radix

I have been talking to a trans. shop about beefing up my 4L60E? (2002 Tahoe 4X2). I am installing a Radix next week, hopefully. I have a cat back exhaust and a Westers tune and another Westers tune sitting on top of the Radix in the garage, waiting for the 3.4" pulley and a gasket to come in from Magnacharger. I was worried about tearing up the tranny so the shop suggested a trans-go shift kit. First of all, do I really need it? If yes, any suggestions on other mode to the tranny to make it hold up better? I've head of servo upgrades and acc pistons and oversized boost valves etc.., this is all greek to me. This is a daily driver that I like to stomp on from time to time, no towing, and I haven't made it to a track yet but that is planned in the future, just for fun. The Tahoe has 65K on it so I figured I better give the tranny some help before I destroy it with the added HP/TQ. Thoughts?
Chris