Need some ideas for a new crankset and chainguide. Any recommendations? Budget is a maximum of 500 for the lot.

I ride a lot of trail centres.

I've got a Stumpjumper FSR Comp EVO '12. I don't really understand what to buy so that a press fit bottom bracket fits, do I need adapter kits i.e. e13 pf30+ bottom bracket? Will this work? I'm guessing I'll need the LBS to fit...

I really like the look of e13 TRS+ crankset and the trs dual ring chainguide but this is mainly because it looks awesome. Half tempted to go with a single ring up front instead...My knees could probably handle it I just can't see what the point of it is.

Comments please.