This website seems to have everything cheaper than Ebuyer, do you think I should get it all from there instead?
Or is the website only good for graphics cards?
Thanks for the advice on the heatsink!
One more little question:
I've been looking at loads of cases, how do I know if my mobo will fit, and does the power supply make any difference - they all seem to be 300W or 350W?
Lowestonweb are better known as Evesham micros - some things good, some bad. Another place usually worth looking at is:
www.komplett.co.uk - their upgrade kits could save you a bit e.g. the Athlon 64 @ 3200, 512 Ram, Motherboard and heatsink would be £287 plus postage, you'd need the Drives, case, graphics card, Keyboard and mouse, and CD/DVD drive to complete the system though.
What I usually do when building a machine is put a spreadsheet up of all the components I want and then put the costs for each supplier I intend looking at - including their postage charges as that can make a heck of a difference. I then populate it with all the parts and try and minimise the cost.
If you are looking at spending £400-£500 you should be able to get an Athlon 64 @3000 system with good graphics card very easily.
As to the socket Athlons 64s use there are 3 types 754, 939 and 940 - 754 is going to be lower end (and the Ebuyer one you specified earlier was 754) while the 939 seems to be the way the high end will progress. 940 would seem to be pretty much dead at the moment.
http://www.explosivelabs.com/reviews/s754roundup/will give you a bit of a heads up as to the differences.
Not sure how much of a premium those extra pins will add - some manufacturers are now shipping an upgradable board that will handle both 754 and 939 processors.
e.g.
http://www.asrock.com/product/product_K8Upgrade-760GX.htmAs to the power supply/case issue - usual rule is get the case with the biggest power supply you can (I usually get 350-400W these days). All normal motherboards should fit your case (unless either of them are small form factor). All that differs is the mounting points and the layout of the connectors at the back of the case.