The 2.400 is still available. The 4.300 is yet in my cupboard. I will only sell it after I receive my Helix amps
Regarding your questions
1) Its best to power a pair of speakers and a sub with a 4 channel amp. That way, you have 2 channels for the speakers and 2 (bridged) for the sub
2) The user name is Kreiger or Krieger. He has a few threads in this section
3) The wiring mentioned is the 6 gauge, 8 gauge and rca cables. They are listed above
You are more than welcome to have a listen to the alto. I live in islamabad so you can come by anytime