Have you purchased the head yet?
Behringer is definately a mixed-audience company. Some people swear by them, others hate them. From my experience, their stuff is cheap, and not very well made.
If I were you, I would look into Ashdown's Electric Blue series. They're 180 watts as well, and are fairly cheap but they're built pretty decently.
If you have purchased the Behringer, or are completely and utterly stuck in that decision, Behringer makes some inexpensive cabinets that you could use with it. If you're looking for a little better quality, look in the For Sale section or Avatarspeakers.com . Avatars are nice and really inexpensive, but then again for the price of a decent cabinet you could get an Electric Blue combo.
You know my vote, but YMMV.