http://phase2motorsports.store....html , has a big selection and also carries URAS/monkey magic, type 4 is my personal favorite.
http://www.enjukuracing.com, has good prices on origin and version select
urethane is awesome, can take more damage etc. but its more $$$ and not alot of kits are made with it so that = gayfibreglass is what pretty much everythign is, and you get what you pay for...im sure youve seen teh same kit by like 5 diff manufacturers right? well its knock-offs of course and yeah save money whatever but you cant rely on fitment...and you want it to look good right? of course you do. get the original genuine version of whatever you like. not everyone agrees on this though, so do what you want.