Mark's pick will not let you down. Rod's is a tad better for a few bucks more. I have one of the ones Mark recommends as well and they will get the job done and on 110VAC, they are great and cheap.
But if spending new money and $50 more will get a fair bit more. I would go Rod's way.
Look on Craigslist and see if there is an 80 gallon "on the cheap" first.
The one Mark mentioned will get everything done for you.