Recommended 1Gb SFP for ~115km?

Hello, Any pointers on real world experience on this topic would greatly be appreciated. What are people using successfully out there as far as third party SFP's go to hit a distance of approximately 115km? This would be for a Catalyst 6506. Cisco's solution was a much more costly EDFA solution, but I see plenty of vendors that make SFP's for Gigabit Ethernet that range from 115km to 150km and more. I know these are not supported by Cisco and TAC won't troubleshoot if they are in the switch. I'm willing to work around that should I need TAC assistance on the switch. What works well for a single wavelength solution at this distance without having to switch to DWDM? This circuit will have duplex fibers. Thanks! -Vinny