You're looking anywhere from $40-$240 for an Intel compatible motherboard without integrated video. Depend on how much money you want to spend on upgrading your motherboard. I like to spend around the $100 range or more if you are a gamer, work on video editing, pictures, audio compiling/mixing, photoshop, AutoCAD, etc. If all you plan on doing is watching DVD, using a word processor, go onto the Internet and play light games, then any motherboard will do.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?