+1 for Watiling tyres. I have always found them pretty good value.
I put on a new Tourance on Thursday, £105 fitted at the St Leonards branch. You can get them for £85 if you are OK to fit them yourself from here; http://www.moto-tyres.co.uk/
Watlings in St Leonards have currently got the old style Tourance not the EXP. They tried to charge me for the new ones by mistake because their supplier had charged them for the new ones but delivered the old style. From what I have read on here, it would appear that the EXP version is softer with less tread depth, so I was quite happy to get the old style. Never had any problems with them.
If you find somewhere better, then let us all know!