Thank you for the responses.
1. Do I go with or without a DSP model? Or get a miniDSP? I run Macbook only at home, will the NX edit software work with Macs?
2. My currently setup was being pushed by ~900 watts at 4 ohms. The 3000 would be about the same with each channel. Then if I went with a Devastator, I could use the same NX3000 in bridged mode, correct? If I am not doing anymore than 1 sub, do I need the NX6000?