New Machine ideas?

I have an Aopen MiniPC 915G that is starting to make some odd noises. I think it is just the fan, but I've also thought about replacing the machine with a dual core machine. So I'm starting to look around for a new machine. I'm looking for something that has a dual core, minimum of 2GB of RAM and preferably a small form factor case. I really like the size of the Aopen box, but the lack of slots is frustrating since I can't upgrade the video. I would like to have at least 1 PCIe 16x slot (low profile is ok). So far the compact machines from HP are looking interesting. Probably reliability and quiet are the most desired features. Does anyone have any suggestions.