that 4 channel 260 watt max amp is going to push out the same or a little more amount of power as the head unit. if you get a good head unit that is.

most aftermarket head units, push 22watts per channel, even though they say 40 or 50 x 4.

my math (may be wrong):
260max (cut in half for rms)=130
130 rms divided by 4 = 32 watts per channel

in my opinion you would be wasting money by not buying a better amp,or you dont need one to power those speakers.