Best tower speakers and amp for $1k or less?

So I just purchased a new 2008 210 and it originally had the four 6 X 9 speakers on the tower and the amp to run them. I had the dealer take them off when they sold me the boat to get the price down some. When I went to pick up the boat, he said he would throw the speakers and amp back in for $1k.

Are these speakers any good? Is there a speaker and amp combo out there I could get for $1k or less that would be a lot better than the 4 stock tower speakers and amp? Any suggestions would be appreciated!