Tim,
I run BakPak skimmers on each of my 30 gallon tanks. It is a HOT skimmer. With your upcoming sump, you will probably be better served with the sump version like fishfarmer mentions.
I have run the Rio 600, Rio 800 and Maxijet 900 as the powerhead. The 600 does not push a lot of water, so I upgraded to the maxijet. The maxijet would not fit into my preskimmer box and I got tired of always having to adjust it. (If you go with the maxijet, make sure you buy the venturi adapter. Premium Aquatics sells them for around $4) I am now running Rio 800s on both skimmers.
The BakPaks are adequate for that size tank. You may want to consider a Remora skimmer. While I have no personnal experience with one, I have only heard good things about them.