In reply to The New NickB:
If you are riding it mainly off road, then lay your hands on as wide tyres as you can fit - at the moment I run Bontrager 35c Jones, which are OK, I've also had Michelin Mud Pros which are good, but I want to go to a Panaracer Firecross 45c. Others worth a look are WTB Nano 40's.
Also funny alt bars are worth a look. I currently run on one midges which are a cheapish dirt drop bar. I want to go to a Salsa Cowchipper, others include the wood chipper, Cowbell from salsa, the Soma June bug, and a new bar by Alpkit. The advantage is that the drops are shallow and flared so that rather than having to bend you arms a lot to get onto the drops and brake, you can ride in a more conventional position and you end up with better control whilst going downhill. They look funny but they work well.
I've also just built a bike with 1x10 gearing and dropstop chain ring, 1-42 cassette and XT clutch rear derailleur. 1x is so much better so far than running two derailleurs - it's blown me away really. They are pig to match up gearing wise as they have a different pull ratio to shimano road gears so at the moment I'm running bar con shifters, but eventually I'm gunning for a Gevenalle set up, possibly with Juin Tech mech/Hydro brakes... quite excited about the new build really!