Well, finally, we get an answer as to why you think fiber is the better alternative. I'll tell you this, CAT6 is not the problem you had with your past file transfer issues. On some of the enterprise networks I've worked on, we have NAS units which have terrabytes of data transfering to large Sun servers without issues. Either the hardware you used for CAT6 was defective, not configured correctly, or just was poor quality, I don't know. Or if your cable terminations were bad or if the PCs/servers you have are not configured correctly. But CAT6 is more then capable of keeping up with Gigabit transfers. Again going to fiber isn't the fix for this. Fiber is just another medium. GigE over fiber is the same as GigE over copper. Some of the reasons fiber is used in a business situation is if distance or security is an issue. There's no coincidence that the only fiber ports you find on mainstream switches are confined to uplinks which are meant for backbone connections where distance usually comes in to play with campus network build outs. If you think you can find transfer speeds greater than GigE over fiber, good luck. The only places you'll see this is in specific network gear and SANs. If you still find performance an issue after ensuring everything else is optimized, you can aggregate CAT6 GigE links to achieve faster throughput...of course with some caveats.
And this is info I doubt you'll get from anyone at Frys. Plus for the record, many of us here don't work for NewEgg which includes me. So I posted the information I did as proof that I'm not being an a**, but myself or others on here are not going to just sit here taking verbal abuse from you when you're the one asking for help.