If you want Schwalbe, look for tyres with 'Snakeskin' or 'Double Defense', that means they have tougher sidewalls. Though probably more expensive, a quick search suggests £45 per tyre.
I'd agree Panaracer Fire XC are nice, though I think they are only available in 1.8 or 2.1.
Worth a look at the On-One own brand tyres, they are getting some good reviews, £15.