well since you already got such a nice HU, i suggest you invest in some decent speakers. I recommend component speakers, but if you have to go coaxial then I suggest the Rainbow Dreamline series coax's. If you go component, get hte Infinity Reference 605c's. As for amps, you could actually power the Infinity's off the HU (but to get the most out of them use an amp), but any decent 2 channel amp that puts out around 100X2 RMS power would be fine. As for subs, check out either the Adire Audio SHIVA's, IDQ12's, Alpine TypeR's, and Kicker L7's. I recommend you get either a SHIVA or an L7, but make sure you have a big enough box for the SHIVA (i put mine in a 1.8 sealed, and yes thats a sealed box!!!). You could also go with a ported box (and i recommend that you do if you get an L7), but remember you lose a little SQ with ported boxes and if they are built wrong you can end up with boomy bass. As for the Sub amp, i wholeheartedly recommend the Lightning Audio s.1000.1d amplifier. It goes for as cheap as $245 and puts out 1000@2ohms, that is simply incredible and for the price you can't beat it. Hope this helps, check out the sounddomain forums for more information.