Abit n7f-s, Epox 8RDA+, or asus a7n8X deluxe are all under $250 canadian on NICX.com (canadian computer retailer) and all 3 are great boards. Personanly I like the Epox and Abit more then the asus. The Asus isnt as stable with overclocking and it costs a lot more.
Any Nforce board will work great, but the ones I listed are the easiest and best overclockers.