Speaker Set up Help

I recently purchased a pair of Wet sounds SW-650 speakers. I am wondering if anyone knows what size amp I should purchase to make these things scream. Eventually I am thinking that I am going to buy another pair, so the amp I would purchase would need to be able to push all 4. But as I said just 2 for now. Any help is greatly appreciated it. Trying to get it all hooked up before my deployment is over! Thanks guys!

HT4 Would work.
110w RMS to each speaker. Theres 4 channels, you could just leave 2 disconnected for now.
http://www.wetsounds.com/pages/products/HT4_spec.html

For a lower priced option I went with this amp. It's driving 4 xs650's and gets super loud and stays clean. The only thing I don't like is it gets pretty warm compared to my other amps but for the money it can't be beat. I used to have a jl hd 600.4 amp powering them that I moved to power my rev10's. the amp obviously isn't a jl hd but in terms of volume I don't think I lost any. http://www.sonicelectronix.com/item_...PAD2000.2.html

Thanks guys! I appreciate the help. I'm gonna look into both of them. I kinda had an idea but just thought I'd ask for a few more opinions.

The Wet Sounds HT-4 would be a perfect amp for 2 pair of XS-650, but i'd like to clarify its output.

With a single 4 ohm speaker wired per chnl, its output would be 110W to each speaker. With a pair of 4 ohm speakers wired in parallel to a chnl, the 2 ohm output would be 150W, with each speaker netting 75W. This route would allow for a 3rd pair or a sub to be added later.

75W rms is still respectable power for a 6.5" in-boat, but if one wanted to really push the XS-650 to its potential, the HT-2 would deliver 300W x 2 @ 2 ohm. Thats 150W net rms to each speaker with 2 pair driven by the HT-2.