GROUPSET

Here you need to keep thing on the strong side. Strong cranks are important because you bash them on walls and rocks etc. Buy something like XT or if you can afford them, Middleburn. Your bottom bracket also needs to be strong because these take a punishing too, and can snap. I'd recomend a Middleburn Steel b/b. The rest of the groupset is basically what you can afford. IF you can buy an XTR chain and a middleburn chainring. The cassette dosn't matter too much, but your trials gear may bend after a few months so just keep checking it to avoid any accidents