I am about to make a purchase. I rode them both. Liked them both a lot but the 19.5 on the 4500 fit me a little better than the 17.5 GF. I know the components are better on the GF but it is a bit more of a financial stretch for me. Is it really worth the extra 150$? Will i have buyer's remorse if I go for the 4500?? Should I take a look at the 6000 too?