This one is a budget board with a $20 rebate right now. It has the basics you would need and it has high ratings on newegg. :http://www.newegg.com/Product/Product.aspx?Item=N82E16813135233
There are a number of budget boards on this page:http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007625%204025&IsNodeId=1&name=%2425%20-%20%2450
I have had a lot of success with the gForce 6150 boards for budget builds. Solid platform. You may find DDR2 memory that is a little less expensive than the DDr3.
If only interested in AM3, here's a good one:http://www.newegg.com/Product/Product.aspx?Item=N82E16813157202
It was recommended from CPU magazine and it features some cool stuff like hardware core unlocking if you wanna try to unlock the 4th core on your CPU.