Seriously...
HP Envy 13 doesn't overheat, is silent and light. Very sturdy build, amazing screen. Picked it up for £499, couldn't be happier. HP Envy 15 is a shit rig made for gaming, I'm a coder and I travel a lot, hence I got the 13 inch version.
Asus u33jc (13 inch) is an amazing machine. Very high quality build, cheap as fuck, great performance, decent screen, great battery life, very portable. Picked it up for £599 I think.
Next laptop on my list is something from Samsung 9 series... going to wait a bit for the price to drop though.
Stop over thinking. If you need osx, get apple. If not -- any of the above will do a stellar job, especially if you're not a hardcore gamer.
P.S. reversed function keys on the envy are annoying.