SSD........ waste of money. get a standard 7500rpm hard drive.
4830......... depending on the games you want to play and the resolution could be iffy. My nephew uses one and it's ok for the older games he plays and plays COD4 at 1024x768 good enough. Wouldn't expect much from it after that. ... FarCry2/crysis/newer titles
Processor....... get the tri-core or a quad. Games are using them now and they're cheap enough.
You really don't need an after market cooling device.
pc6400 ok IMO. You're not going to know the difference between that and pc8500.
Boistar boards. I've used a few. For a budget build they are fine. Good luck.
Ok guys would it be better to get a 4830 at first and then save the extra £45 for later so I could get another one and use them in crossfire since in 4830 cf vs 4850 cf the 4830 in cf comes out on top.