Not gonna chime in on what you should get, but a few tips for when you get it:
1) You'll have to tweak it for the first several days/couple of weeks, so know it's going to require a little attention up front.
2) Follow manufacturer's recommendations for water height (set it on top of something if your sump or back chamber isn't already at the right water height) and then open the air or water inlet dial all the way and then back it down until the top of the bubble turbulence/water boiling movement is almost (but not all the way) at the top of the neck of your skimmer, and under the skimmer cup (if it's higher, you'll wake up to an overflowing cup ... folks sometimes set it higher because they don't see immediate skim, don't do that at the beginning!).
3) Dial in the skimming level you want (if you want a dryer skim with dark brown/black skimmate, set the water level in the skimmer neck a little lower--this is what most people do, and you won't have to top off water as much; if you want a wetter skim with tea-colored skimmate, set the water level in the skimmer neck a little higher (this is what I do) but you'll have to top off water a little more.
4) Once you've found your preferred setting and it's stayed constant for several weeks, generally, you should leave it there. When you do water changes, it might seem like it's stopped skimming; don't touch the dials, it will come back.
Hope that helps, let us know what you choose!
