Processor Vs Mobo

[Ashley Long]

basically im looking for a new processor and mobo combination for around £200-£250.

currently i have an AMD Athlon 4200+ which is overclocked slightly. i have upgraded the rest of the system and mobo/cpu is the only thing left to do..

Memory:8gb PC2-6400
Graphics Card(s):ATI Radeon 4870 512mb
Power Supply:Corsair 650W

Uses: Gaming, programing, uni work etc
Overclocking: will be...

i have narrowed it down to a few processors and a few mobo's interested for some opinions on what ones...

a local shop is selling;
Intel Core2 Duo E8200 2.66Ghz 1333FSB @ £127.22
Intel E7300 Core 2 Duo 2.66Ghz 1066FSB @ £106
Intel Core2 Duo E6550 2.33 Ghz 1333 FSB @117.44

or from OCUK
Intel Core 2 Duo E7400 2.80GHz (1066FSB) @ £113.84
Intel Core 2 Duo E8400 3.00GHz (1333FSB) @ £151.79

for the mobo i was thinking:
Asus P5Q Pro Intel P45 @ £116.14 with one of the cheaper chips.
Gigabyte GA-EP43-S3L Intel P43 @ £74.74 with one of the expensive chips.

And a,
Arctic Cooling Freezer 7 Pro CPU Cooler @ £19.54

what im trying to decide is it worth buying a cheaper chip and the P5Q pro which is a good overclocking mobo and getting the best performance out of it or getting the cheaper board and a better chip. i will be looking to upgrade the processor to a quad core in a year or two.

Also is there any better cooler (within my budget)? i currently have the Arctic Cooling Freezer 64 Pro PWM CPU Cooler running on my AMD Athlon 64 X2 Dual Core 4200+ which seems to be doing a good job atm (i will lose that when i sell my mobo and processor to my brother).

thanks for your help in advance...