That Y500 is pretty much exactly what I'm thinking of getting specs-wise but about £200 cheaper than the one I was looking at. Annoying that the offer isn't available in the UK.
I'm thinking I might drop my CPU down from the i7-3630 quad core to the i5-3230 dual core. It'll save me £65 or so which will drop my total down to around £575, which is much easier to swallow than £640+. I think not having a laptop, and never having been current with PC gaming previously, is making me over-reach when it comes to deciding what to go for. I've been checking a few games against the CPU based on
this site and it seems like everything current (Bioshock Infinite, Tomb Raider, Arkham Origins) will run well on the i5 too, and I should probably try to keep my total spend a little lower. The only thing holding me back is wondering whether I'm going to be shooting myself in the foot when it comes to playing games that get released in the next year or so.