gusman: Very nice. I'm familiar with Ikesound... but unfortunately their international shipping rates are pretty harsh. They overbill, huge. Ikesound.com actually sells their stuff on ebay $20+ dollars cheaper than they do on their website. I'd recommend trying there first.
As for the 4 channel-amp, I went with a Concept CC-504. I forgot about this posting, so I might as well make this an update.
Head Unit: Pioneer Premier DEH-P740MP (3 4-volt rca preamps out, mp3 playback, sub control, insanely details lcd display)
Fronts: Polk Audio eX2540 component set (4" 2-ways and .75" tweeters + crossovers)
Rears: Polk Audio eX369 (100w rms @ 4ohm, 6"x9" 3-ways)
4-Channel Amp: Concept CC-504 (2x50rms + 2x100w rms @ 4ohm, 14.4V, S/N Ratio: 100+dB)
Subs: Polk Audio dX10's (10", 300w rms each @ 4ohm)
Sub Amp: Infinity 202a (600w rms)
I ended up paying _way_ more than I originally hoped to spend... but its worth it.