Better than an E2160?
Well I was planning on getting a new motherboard soon too, and overclocking that C2D. Budget overall? Well, motherboard, RAM, CPU cooler and CPU would be possibly around £150? Perhaps slightly more.
E2160 is the best for that budget then.
E2160
P31-DS3L
2Gb OCZ PC6400
Arctic Freezer 7 pro
Should come to about £150 total.