If you're at all handy the best bang for the buck I found was the Avast CS1.
Rated up to 200 Gallons. It comes as a kit that you assemble yourself. It took me half an afternoon to get mine put together and it was fun. It's a recirculating skimmer so water depth is not important. It's about $300 including the Sicce PSK1000 recirc pump.
And how sexy is the smoked acrylic?
Here's the product details:
http://www.avastmarine.com/ssc/do/pr...ne-Skimmer-Kit