What shift kit to put in a 700R4?

I have a 700R4 behind a 350 in my S10. I had the tranny rebuilt but the shifting is stock. Actually I'm getting a little bit of slipping in the 2-3 shift at anything over half throttle. My TV cable is adjusted right and my fliud level is perfect. It's got about 4,000 miles on it since the rebuild. I am getting a shift kit but don't know what to get. B&M, TCI and Transgo are some that I have seen. What kind of experiences have you guys had with any of these? and how exactly do they improve the shift?

Is the trans slippingat the 2-3 shift or is it just taking to long to shift. If it is slipping the 3-4 clutch pack is going out (rebuild time) if it is just taking to long to shift at full throttle a valve is sticking it can be fixed while the pan is off to install the kit have a trans shop look at it before you buy a shift kit. I have used trans go and fairbanks kits and had no problem with ether.