I disagree with the above. In either case your're just going to get a good section of the signal chain. Just like a metal chain, I've found that a signal chain will only be as strong as it's weakest link. If you've got a great pre with a crappy interface your pre won't be utilized to it's best potential. Neither will your mics.
By the way, double posting isn't exactly the best strategy. Check out your previous post for my opinion.
By the way, the RNC is a compressor made by FMR, and there's nothing wrong with Focusrite, if you knew anything about them you'd know they make some stellar pres (ISA, Red). And Ebay can be challenging for deals...I would recommend the used section here or at gearslutz first.
Jacob