XILLAX said:
instead of that CPU & cooler, could i get
Intel Core 2 DUO E6300 "LGA775 Allendale" 1.86GHz (1066FSB) - Retail
which is (£129.24) inc vat
and Retail means it comes with a cooler?
and OEM means without?
and what is arctic silver 5?
OEM means just the CPU, retail means it comes with a cooler. However the cooler isn't very good and it's pretty loud, and also if you want to overclock later on, the cooler probably won't let you as it won't be able to cool your CPU down enough. The cooler in the retail box is a bit pants, you see.
I think you're best off with the Gigabyte S3 mobo though...
Arctic Silver 5 is Thermal Grease. It goes in between the processor and the cooler, and basically instead of just having metal against metal without thermal grease, where you're bound to get slight air gaps, it fills in the gaps and makes heat transfer properly from the processor to the cooler. And you get a MUCH cooler computer than you would with out

You'd have to be silly to not use thermal grease

But retail coolers come with it already applied to them, hence you don't have to buy it when you get a retail unit.
The thing with the E6300 and the cheap 5300 ram, is that you will end up with an overclock limit of about 333*7 ~ 2.4Ghz.
But if you get the 4300 with cheap 5300 ram, it will have a limit of 333*9 ~ 2.99Ghz.
So you'd be able to overclock the 4300 further before your RAM is getting stressed. So I'd recommend getting the 4300 + Cooler, as you will get faster speeds and cooler temperatures, if you're prepared to learn a little bit about overclocking.
However with the 6300, you'd have the retail heatsink. So you won't be able to overclock much at all, as the retail heatsink you'd get with it won't cool it down so much. Also, as the CPU has a multiplier of *7, basically maxing you out at 333 (the speed of the RAM) * 7 which is 2,400Mhz. In comparison to the 4300 having a *9 multipler, giving you a max speed of 2.999Mhz...
You could run a RAM divider on an E6300, but I think you'd get better performance with the 4300 as the RAM:FSB would be at 1:1...
What does everyone else think?
EDIT: oh, and if you're not overclocking and you don't fancy learning how to... then I'd go for a retail E6400 if you can!