System - Best way to wire this?

All right so I'm trying to set-up a system on a limited budget. First time owning a boat and don't know how much time and money I want/will be able to invest. Here is what I have so far and what I was planning to do, and wanted some opinions.

AMP
Crunch P900.4 (yes I know this is a low end amp but this is what I have, for now)
Specs:
4 x 115 @ 4-Ohms
4 x 225 @ 2-Ohms
2 x 450 @ 4-Ohms
(more detailed info here http://www.maxxsonics.net/manuals/crunch/pdfs/P%20series%20PowerZone%2008%20Amp%20Manual.pdf)

Interior speakers:
(4) Polk db651
Electrical Overall Frequency Response 35Hz-22kHz
Nominal Impedance 4 ohms
Power Handling (continuous) 60 w
Power Handling (peak) 180 w
Efficiency 92 dB
(more detailed info here http://www.polkaudio.com/caraudio/specs/specs/speakers-systems/db651/)

Tower speakers:
Kicker KMT6's (based on the other thread I think most are familiar with these speakers)
Max Rec Amplifier Power (watts PEAK/RMS)* 300/150
Sensitivity (dB 1w/1m) 93
Frequency Response (Hz) 50-21k
(more detailed info here http://www.kicker.com/kmt6)

Okay so here is how I was planning to wire this all off the 4-ch amp. Each pair of the Polk's I would wire in series from Ch1 and Ch2 of the amp (like this http://akamaipix.crutchfield.com/ca/learningcenter/car/subwoofer_wiring/4SVC_4-ohm_2ch.jpg), so Ch1/2 would be at 2 ohms and then the KMT6 toer speakers I would wire normally into CH3/4, but I was thinking of running these in series too in bridged mode from Ch3/4.

Thoughts? At this point I'm going for loud, eventually I'll need to add a sub.