I think what you have is most definitely fine, but as you learn to use reaper you'll probably want to expand your palette. For instance, you may eventually want to get an interface with midi in/out support so you can record virtual instruments. some day you might want to record your acoustic guitar, etc. it seems like you're already starting to see the limitations of your rocksmith cable. That being said, its still a good way to learn to use reaper. That being said, welcome to reaper! I'm still pretty new around here, too, but rest assured that everyone here is friendly and helpful. I would say keep learning about reaper and try and think about what you hope to accomplish with it someday. After you have an idea of your goals, we can help you find the right interface for your needs. Best of luck, Al B.