One thing to remember here is to make sure your proposed board(s) support 5VSB to the USB ports, so that you can wake from sleep using your remote. Similarly WOL support is also important for a server HTPC. You may need to do some quite deep research on this, maybe even in user forums, before buying.
I used to use an eVGA7100/630i MB (only a year old) which had neither of these features, making it a pain for an HTPC. The eVGA claimed to support WOL, but even though there was a setting in the BIOS, it turned out that wasn't true (at least not wake from S3). [I replaced it with an ECS Intel G43/X4500HD-based board which works great.]
I used to use an eVGA7100/630i MB (only a year old) which had neither of these features, making it a pain for an HTPC. The eVGA claimed to support WOL, but even though there was a setting in the BIOS, it turned out that wasn't true (at least not wake from S3). [I replaced it with an ECS Intel G43/X4500HD-based board which works great.]