1) i found you on eggxpert while searching for a solution and i lolled.
2) it would have been nice to see a link for your motherboard... but whatever, since i found you on eggxpert, i got it
3) you are NOT limited to conroe, that is one of the slowest/cheapest processors you can get. based on the link of your motherboard, there are other CPU compatabilites. such as Intel Pentium D 8xx series, i found a bunch of good ones on newegg but i'm not sure on the prices since they are ALL DISCONTINUED... so you might have to find a used one or mint one on ebay or something...
Intel Pentium D 945 3.4 GHz BX80553945 Processor - Get great deals on items on eBay.com!
thats the link for the whole search i did for the best compatability (pentium 9xx series) most of them are under 100$ except the actual new sealed box one. haha
intel core 2 duo e6700 items - Get great deals on Computers Networking, LGA775 Socket items on eBay.com!
ebay link for Core 2 duo e6x00 series. the processing speed is about .7Ghz slower than pentium, but i personally do not know the quality and difference between them. it is a personal decision whether to get one or the other. i don't use intel so i have no idea in the quality difference of pentium or core 2 duo, but i would probably suggest core 2 duo since its the next generation core compared to the Pentium... probably contains better technology than the pentium even though its slower.