I don't mind going 2nd hand at all – in fact that's how i've bought all of my bits for the bike so far.
Tails i've only been riding since about May but bought my Orange Gringo 2nd hand, albeit the bike had had very little use since new. I've definitely been bitten by the bug but can't afford to upgrade the whole bike at the minute.
Probably got about £60-70 tops when i get paid next week but may be tempted to stick with 8 speed XT it if i can find some good stuff
Thanks