Thanks, guys. In answer to your questions - I knew that the amp was about to go and there is rust on the terminals, so even if it wasn't then I would still say that it's about time. I'll go up there tomorrow and see what brand/model it is, but I don't know that I really need to move up to a higher wattage model as I had never had an issue with clariry or insufficient volume. I am not worried about adding adding additional speakers in this case either as I have seperate amps for the tower speakers and sub (i.e. 3 amps total) so I can only imagiane that this amp will only ever be used for the 6 Polk's. In terms of quality, I absolutely want a solid product, but I am not looking for top of the line - I figured that there was probably a common product that a lot of people ran/suggested which is why I asked (since a lot of people on here seem to run the Polk's - this is actually where I got the suggestion for them as well). THe only other detail that may be relivant is that I am controlling everything through a wetsounds EQ (which I LOVE and highly recommend to everyone to give the ability to control the in boat and tower speaker volume seperately from the driver's seat).

I am surprised to see the recommendations of the 4 channel amps, this may be a little basic but I would assume that since it's running 6 speakers that I need a 6 channel amp... I will look into the Kicker ZXM700.5 - THANK YOU!