Well it seems alot of people here like MSI, I hate them and I think they are crappy and cheap. But if you want a budget mb go with MSI, but expect problems, especially with power distributions. I bought two of them for my old computer and both times that is what was wrong with them. The comp kept restarting itself, I replaced the mb with an Asus and never had that problem again, so I will stick with Asus.
Additionaly, I would go with at least an AMD Athlon 64 because it will prepare you for the 64-bit software and hardware coming down the line, plus AMD is around 15-20% cheaper than Intel.
Here's a tip. If something is cheap, there is a reason for that. You get what you pay for most of the time.
If you choose to go with Asus and an Athlon 64, Asus has a new mb out that uses heat pipe technology instead of fans to dissipate heat. Check it out here
, although it is a little pricy. But there is a little bit cheaper version with the same technology here
I buy the majority of my parts from ZipZoomFly.com
, they have free 2nd Day Air on most products and they usually keep things in stock.