I agree with Shane (Reefmaster) on the pump. Little Giants make too much noise.
I would recommend any of the following:
Iwaki MD-55. Gives good flow rates and can also be used to run a skimmer at the same time. If you really want some water movement get a 70 and run all of your equipment with this. (
http://www.iwakiwalchem.com/)
CSL T4 - nice quite pump and gives about 1200 gph at a 3' head. I run a T4 on my 180 and cycle a T3 to create the wave motion.
MAK are good pumps as well.
I am sure there are many others on the market but these are what I recommend and use on my own tanks.
One thing I would suggest if you are drilling your tank is to visit this guys site and click on the Standpipe link. (
http://www.rl180reef.com/frames.htm). I have a somewhat modified version of this and it makes all the difference in the world on lessening the water sound.
Good luck (and drill the tank).