Here's a real nice motherboard & CPU combination: CLICK ME
Please note, that it has a locked multiplier though, which means your overclocking abilities will be limited. However, for what you want to do with the rig, that shouldn't be a problem at all. Besides, it has the black edition Phenom quad, which is plenty fast at stock settings.
I like the fact it has an onboard NVIDIA GeForce 8300 GT GFX chipset, along with hybrid SLI. So you only need one physical PCI Express GFX card.
My next rig will be very similar to this one. I'm sold on the NVIDIA GeForce Northbridge chipsets.