The only amps that compare sto the Audison VRX and McIntosh amps would be the DLS and TRU amps. The problem with TRU is that they are hand built in the US and therefore are difficult to get. DLS is tough to get being that most retailers don't know about this european brand of amps and speakers. They have won the national and international IASCA championships over the last two years. All amps in the post are increadible to listen to but it all depends on if you want to spend the money for this product for a boat. I think good speakers(like focal, Diamond, or MB Quart) with a ton of efficient power works better for a boat application.