No problem! Top of the line motherboard $140 to $160 AMD XP 1900 $110 Memory PC2100 256MB name brand $50 to $60. Check out
Anandtech or
sharkyextreme for reviews on motherboards and just about anything else you want to know. And when you decide on a MB go to the manufacturer's web site and check on what brand of memory the recomend. Some motherboard's don't like some brands of memory. i.e Asus and Micron
With that kind of budget your in plenty good shape! Also check out the hot deals forum on Anandtech. You can pick some great deals off that sometimes!