My opinion is to go with the TA05. Much easier. TB02 isn't bad but not on same level with 05. Fixed gear ratios on the TB make it harder to deal with....especially with the gear ratios needed for VTA 25.5. TA05 also has MUCH better parts availability from both the factory and aftermarket.
As for necessary items..you nailed it...Body, wheels, tires, 25.5 Novak motor and proper esc. You can buy the remanufactured 25.5 VTA combo on Novak's website for around $104 bucks. If i can make a suggestion, take a hard look at the new Mongoose ESC and motor combo. The Mongoose has OUTSTANDING brakes. really cool to out break the competition and bail into turns really tight.