I have replaced and added a few things since buying it years ago.
*I upgraded my RAM
*Replaced power supply with EVGA bronze 600w
*installed ASUS HD7750-1GD5-V2 AMD Radeon HD 7750 VGA 1 GB GDDR5 Graphics Card
* Replaced hard drive with Western Digital WD1002FAEX Caviar Black 1 TB SATA III 7200 RPM 64 MB Cache Internal Desktop 3.5" Hard Drive
I don't know anything at all as far as motherboards go.. I don't want to get anything that is not compatible with what I have. Any advice would be extremely appreciated!
Some advice I would have is to go to a website called PCPartPicker. Select everything except your motherboard, and when you are ready to choose a motherboard, or view them... it should only show the compatible motherboards. In terms of what motherboard would be best, I can't help you there. But this should at least show you what is compatible.