Comments/Advice on proposed new Wetsounds System

I've been looking to install a new system on my 2003 MC X2 for some time and am finally ready to pull the trigger. I'm not a "stereo guy" and I did email WS and get their advice. Just wanted to know if any of you more experienced stereo junkies had any input...thanks in advance!
Proposed products; all Wetsounds

2 pro80 tower speakers powered by syn2 amp (maybe one 485 instead?)

4 x XS650 speakers in existing 6.5 holes by syn4 amp

sub: xs-xxx by syn 1 amp

ws-420

Biggest questions I have is which deck to use, sub placement (seems usually under driver's side) and batteries.

All to be installed by my MC dealer.

Thanks!