right now i have an 05 hardrock sport with no disc brakes. i like to jump it, and trail ride with it but its just a bit big. it is the XL which i believe is the 21 inch frame and im only like 5 10 or 5 11 my budget would be about 400 maybe stretching it to 500 if i changed bikes or i could trade in on a newer smaller hardrock. for a lot less money. im not quite sure what i should do. if i do swap bikes what decent bike could i get used for under 500 bucks thanks.