check dabs or laptopsdirect mate, they usually have some good stuff on sale
the samsung series 5 on dabs looks pretty sexy
I got a Samsung 5 and can tell you that it's pretty awesome. It's the core i7 one though which I can't see on dabs. The one they have for £550 is a core i5 without full HD but as you said for £300 do you really need it?
The first one I got had a faulty pad thingy which tainted my first dealings with Windows 8 somewhat.
Now that I've got one that actually works I'm getting used to Windows 8 to the point that I think I'll end up liking it as much as 7.
This laptop's not as high spec'd as my PC but it seems loads quicker. Maybe it's because it's new and not cluttered with porn yet or maybe it's the OS that makes the difference.
Either way it's lightning fast at everything you mentioned you want so I'd highly recommend.
Agree with subZERO that it looks pretty sexy albeit a bit large due to the 17" screen. If you want it to be portable I'd go for something smaller tbh.