If you have access to the TA05 setup bible you can check the downforce values for the individual bodies that come with the various kits. Unfortunately I lost mine. That might help you in choosing which kit to use becuase the body shape does make a difference.
Definately go with the TA05R if you can. I bought one off ebay. Its an awesome buy, trf shocks, low friction belts, lightweight suspension. It will cost you less in the long run to buy the kit and a body than to buy a standard kit and then add the hop ups afterwards.
Someone was saying to go with a cyclone? I had a cyclone s, I would go with the TA05 anyday, at least the diffs in the 05 are reliable.
I dont know much about the TA05IFS other than having built one for my mate. I didnt have a chance to play with it. THe body looks phat though.
Hope that helps, and dont be discouraged by the flack.