definitely wouldn't go for the rockhound... the best thing you could go for is either a control or a t-rex...both very strong, dependable frames. And i'd 100% go second hand, i built my bike up from scratch from 2nd hand bits, and it ended up costing me £200...a build that would have set me back around £800 new. So, in conclusion....low to mid bb ( 0-25 ) short (1065-1080) frame with some decent components, pm me for any other advice etc..or just ask on here... best of luck in finding a steed that ticks all these boxes.