Replacement CPU/Mobo help

My wife has been using my old gaming rig and it died a few weeks ago. It will not post and I get no beeps from the mobo. I have tried swapping out the ram with no luck. I am assuming it is either the mobo or cpu. I figured I could just get a new cpu/mobo combo and reuse the rest of the parts. She primarily uses the PC for scrapbooking, internet and basic games (Plants v. Zombies, etc). Trying to keep it as reasonable as possible I was think about the Athlon II X3 440 which newegg has for $84. It has 2-250gb hard drives that are in raid that I will probably yank out of raid and just run 500gb of storage. Here are the rest of the parts I would like to reuse:

• 2 x 2048MB Corsair™ XMS2 DDR2-800
• 512MB eVGA™ NVIDIA® GeForce™ 9800 GT
• 2 x 250GB Western Digital WD2500JD 7200rpm SATA/150, 8MB Cache - RAID 0 Stripe (500GB Total)
• 550 Watt Antec® TRUE POWER 2.0 Quiet Power Supply
• 16x Lite On® DVD+/-RW/CD-RW Dual Layer
• 16x DVD/48x CD-RW Lite On® Combo Drive

So, which mobo would be best around $100 and am I over-looking any compatibility issues? I doubt I will OC at all or minor OCing at the most. Thanks for any advice in advance.