I'm plannng to install an amp to power 3 sets of JL Audio VR 650's in my boat. I've been to every audio shop in my area and have narrowed it down to the following:

Concept HP65.4
JL Audio 300/4
Memphis 16-MA3004

I've also had recomendations for RF and Kicker.

My priorities are for SQ and durability.

Thoughts

JL might be a lil more money, but i'd go for it for the quality and durability

clarion makes some bad ass boat amps...though they dont have a ton of power they are 100% waterproof and rock solid agianst shorts and are all gold plated terminals so corosion isnt a problem with salt water. they are the only amps ive used that where designed/made for the boating environment...of course iveo nly done 2 boat insalls one of which was just some "full range" speakers, radio/CD, and 8" IB subwoofer in our boat.
and the other was 2 kicker l5's on a wakebaord tower along with 2 coaxil pioneer 6x9's. with 2 pairs of sony xplod coaxils in the boat.

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Thanks for the input. I decided on the JL and it will be installed on 6/8. Can't wait.