Asrock (rebranded Asus) H67M (2x DDR3) or H67M-GE (4x DDR3) can be good candidates for budget socket 1155 servers:
http://www.asrock.com/mb/overview.asp?Model=H67M
http://www.asrock.com/mb/overview.asp?Model=H67M-GE
both comes with Realtek RTL8111E Gb NIC port (the same NIC found on Intel D525MW Atom baord) which is supported by CentOS 5.5 stock kernel
newegg is selling H67M for $89
http://www.newegg.com/Product/Produc...82E16813157220