again i'm not sure if motocross style means inverted, but for about 1500 i'm sure you could find some bike in the classifieds on mtbr or pinkbike with a shiver or dorado. those are the two forks i would go with if i were getting an inverted fork. but you could look for almost anything. big hit, stab primo, v10 maybe, m1-again not sure how much those go for. maybe a karpiel. just check out some of these and see which bikes you like. maybe even a banshee scream with a shiver or dorado. just look at some of these. good luck with your search.