I have a 2200D, and my buddy has a 4000.1D I say that you should go with the Autotek. Both amps are strong though. Mine is pushing a 15 inch HDC3 and his pushing 2 18inch HDC3s.I know I can get the Autotek MM 4000.1D right now from http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=18160 for 699$$ Right now, but I dont know howthe quality of the Autotek amp will compare to the AudioQue
the dif between the is GP2500 and GP3000pro is the GP2500 is peak NOT rms. i didnt know they came out with a GP3500 good they got a bigger amp in there line.The MM4000.1 is a beast but so is the Crunch GP3500. Ive been told that the 2500 and 3500 Groundpounder amps can be ran at .5 ohms without trouble. I will be doing that with the 2500.
I can get a refurbished sundown from http://www.db-r.com/sell/store/index.php?productID=146 with a one yr warranty for 675$$ shippedhere let me save you the trouble...http://www.caraudio.com/forum/showthread.php?t=368854
No doubt here brother, that is a deal and a seriously rock solid amp. I wouldn't hesitate on thisbuy the 3000d sundown in the for sales thread for 630 shipped if i recall by grinder you wont regret it..