I think it would be fine. They have to be tested and everything before hand (atleast I think so) to make sure they work so I would go for it. Really if you have probelsm with the stuff newegg is very good with RMA's.
Oh I just thought of this. Does the refurbushed motherboard come with any cables or anything? That will be exra stuff you will have to buy.
The Amish computer:
AMD Opteron 165 CCBWE 0551@ 2.25ghz(250 x 9) 1.45v cooled w/ Thermaltake Big Typhoon | DFI LP Ultra D | eVGA 7800GT@ 465/1110 | Sound Blaster X-Fi XtremeMusic | 2GB G. Skill DDR 500 @ 250mhz 3-4-4-8 | 80 GB SATA + 40GB SATA + 200GB IDE| 480w Thermaltake Silent purepower | Thermaltake Tsunami Dream case (Black) | Windows XP Pro |