Sound like he is looking for the cheapest way out to me so i would go for the 450. When it come to dressing up a shee you should go for the best and most logical proformance part for your kinda riding. (NOT THE CHEAPEST) I will put my vote in for a 450. but good luck and happy trails in what-ever you buy....
2003 banshee,tr6's,trinity stage 4 head, 20 cc turbo domes,k&n filter kit w/lid removed, A/C front and rear grabs, removed rev-limiters, and bandits front and rear...