Re: all out stereo
See signature for suggestions. I recommend it all.
Why do your Infinity's keep having to be replaced? That doesn't sound right. Which models do you have and what are they doing? Sounds like you may have a problem with how you're driving them, not the speakers themselves.
If you're not down for the Infinity's, go Polk all the way. Truth be told, I kind of wish I had from the beginning. Polk's highs are so ridiculously crisp and clear that it puts Infinity to shame. Infinity takes it on the low end but Polk rules the highs.
I've never used Wet Sounds equipment, but judging from the website it looks to be quality but way, way over priced. If you're in a money-is-no-object kind of mode, go with those, JL Audio speakers and a JL Audio marine class D six channel amps. You'll spend literally 5 times as much as you would on just about as comparable of a setup with Polk/MB Quart, but as long as we're throwing money at things.. hey.. why not. Class D amps will do down to 1 ohm per channel with no problem.. just use 1 AWG marine grade cable only. Use channels 1-4 for your highs and bridge channels 5-6 for your tower. I would be running at least a 100-150A marine grade alternator as well. Make sure you use 1AWG cable on the alternator for both the power and ground wires. (Bracing myself for the imminent discussion on god forbid using anything but a stock alternator)
Use Mediabridge copper clad aluminum speaker wire exclusively as well. It stands up to corrosion much better than traditional copper wire. Search Amazon for it.