Hey, I have some questions about upgrading my basic recording equipment. First off, I really only record my guitar, occasionally vocals, but they aren't a priority at all. What I have now is a SM57 Mic, and a Tascam US-144 USB 2.0 interface. And my new MBP will get here Thursday and I will be using either Garageband or Reaper as my recording program. What should I upgrade? I think the Mic is fine, but the Tascam isn't the best. I was thinking about getting a PCI card to replace the Tascam but I'm not quite sure what else I'd have to get. Does upgrading the PCI card void the warranty on my MBP? If I don't get a PCI card then I was thinking about just upgrading my audio interface. I was also thinking about getting a mixer, but I'm not sure if that will help. I have about $200 to use, maybe more if I wait longer. What should I do?