OEMs for X2 10G LAN PHY optics

Hi, I am searching for opinions on OEMs of X2 form factor 10G LAN PHY optics. We've found that most router/switch vendors mark these particular items up significantly just to provide their own sticker/EEPROM ID. As such, we'd prefer if we can to procure from the OEM (or their reseller). Is this a situation where any company who's a signatory to the MSA produces suitable modules, or are there particular OEMs to prefer (or avoid)? If it matters, the prime platform we're looking to plug optics into is the WS-X6708-10G module for a 6500/7600. Thanks in advance --Duane