stereo receiver questions --

here are my two choices:

Boss MR1200S $90
subwoofer output (bass max)
dual rca outputs
50w x 4 channel
built in amp

vs.

Clarion XMD1 (refurbished) $100
45w x 4 channel
4 channel line level output
4 channel speaker level output
front/rear preamp outputs (2 sets)
rms power output: 16w x 4

I was also interested in this amplifier to power the receiver and a sub...

Blaupunkt PA2150 $90
150 watts x 2 @ 4 ohms
200 watts x 2 @ 2 ohms
variable high/low pass crossovers
preamp outputs

I don't need a system to rock the whole lake, just want something decent. Would I need one or two amps?
I also want a receiver that will handle some wave action on the water and not be skipping all the time.

Thanks for the help guys.