wow...i was reading up on some other posts in the forum, and the mugens weren't upgradable from older version to newer versions. And now that I think about it, you are right for saying that we shouldn't look foward to a car that can be upgraded to newer version, cause that would be like cheating us, cause we'd be just paying for a few upgraded parts, and the rest of the car is still the same.
now the rumors of the mrx4 flies around, and some1 just posted a site that has it on preorder, i'm going to wait a while and see what people say about it. Most likely i'm going to stick with a mrx3 though.
Thanks for all your advice peeps, keep em comming if you will. ^_^