Ok, well, i'm new to this and I just don't want to pay more than I have to by buying the wrong thing.

I'm looking at getting:
Kenwood DPX302 Headunit: 22 RMS/4x50 Peak
6x9 Kicker Speakers: 70 RMS/140 Peak
as well as
15" CompVR Kicker: 500 RMS/1000 Peak Dual-4 Ohm
or
12" L7: 750 RMS/1500 Peak Dual-4 Ohm

The problem I am having is what type of amp to get (Kicker Amp). For the amp how many watts do I actually need? I read that you only need to worry about the RMS, but I don't know if that was true or not.

I also need help on what type of wires to get as well.

Money really is no object, but I don't want to pay more than I have to. If anyone can help, your advice will be considered, but I do need it quick.

Note: It will get professionally installed.

try posting in the audio & electronics topic dude.