Should be picking one of these up tonight, standard apart from having 1gb of memory instead of 512mb, and I'll be sticking an 8gb SDHC card in there too.

Think it comes standard with GNU Linux, but is there anything better than this?

It's only ever going to be used to surf the internet with Firefox, but I want it to be as fast as possible whilst doing so, which could rule XP out, but hopefully someone knows better than me!

I'd be installing any new OS form an 8gb USB pen drive too if this makes any difference to my choices. Thanks in advance.