I have been using my Tascam DP-02CF Portastudio, but I only use it to record and I do all mixing on the computer. So, I'm ready to upgrade. Plus I'd like to take advantage of having more preamps for more mics. So I'm pretty sure I want to go firewire so that I can have less latency and more tracks. I want to spend around $400 and will buy used if I can. I'm just looking for something that I will want to use for years without replacing. Thanks.