Small Form Factor Would like some advice on a new mobo

I'm looking to upgrade my gaming PC. I'm currently using a proprietary form factor PC - the Philips LX1000.

It's fine for my gaming needs as I only play Counter-Strike:Source and don't see myself playing any new games for the forseeable future (I'm not a hard core gamer). The problem I have is that the LX1000's NVIDIA 6600GT drops frames when the gameplay gets intense. I want to upgrade the graphics but this will mean upgrading the entire PC as the LX1000 is a fixed-system design with no upgrade options (save for RAM and HDD).

I would like to keep things SFF, and I have a socket-939 Opteron 144 still in its original packaging, which I want to (finally) make use of. I know this limits my options quite a bit but I would appreciate some feedback on what mobos I should consider.

So far I've failed to find any s939 mini-itx boards and a handful of mATX. I know Shuttle makes some models that accommodate the s939 Opteron but they're quite expensive in comparison to mATX.

I would also like something that maximises its useful life. By this I mean I could use the mobo as a home server in 3-5 years if I decide to upgrade to a new PC. More than one ethernet port would be handy and Gigabit, if possible. Onboard graphics would be useful although I won't need anything more than 2D as I'll be using an NVIDIA PCIe x16 card which I'll take out when it's time to use it as a server.

Any advice will be appreciated.

 

Given that your options are already somewhat limited, it would be an idea to list the ones you've already looked at, to prevent getting suggestions for those same boards

ASRock 939N68PV-GLAN:

NVIDIA® GeForce 7050 / nForce 630A MCP Chipsets
Supports Dual Channel DDR400 with 4 DIMM slots, maximum capacity up to 4GB
Integrated NVIDIA® GeForce7 Series (NV44) DX9.0 VGA, Pixel Shader 3.0, Max. shared memory 256MB
1x PCI Express x16 slot
Hybrid Booster - ASRock Safe Overclocking Technology
Untied Overclocking : During Overclocking, FSB enjoys better margin due to fixed PCIE/ PCI Buses
Dual VGA Output: Support DVI-D and D-Sub ports by independent display controllers
Supports HDCP function with DVI-D port, to enjoy better quality with High Definition HDCP Encryption contents
NVIDIA® PureVideo™ Ready
Supports Gigabit LAN 10/100/1000 Mb/s
4x Serial ATAII 3.0 Gb/s, support RAID (RAID 0, RAID 1, RAID 0+1, RAID 5, JBOD), NCQ, AHCI and "Hot Plug" functions
Chipset embedded HDMI Audio which supports HDMI signal through DVI-D port by using DVI to HDMI adapter (not bundled)
7.1 CH Windows® Vista™ Premium Level HD Audio (ALC888 Audio Codec)
Windows® Vista™ Premium 2007 Logo Ready
ASRock DVI/H I/O: 1 x VGA/DVI-D Port, 1 x VGA/D-Sub Port