ASM for price.
Euroreef for simplicity and excellent build.
Deltec, well because it's a Deltec.
H&S, because the 3 above it are all clones of the original H&S.
Bubbleking. A whole new idea to skimming. Pure genius.
If the price seems like a good deal then the skimmer generally isn't. Expect to pay above $250. You can find deals on the ER ESV-5 on Ebay all the time. It might save you some dough.
Stay with needle wheel skimmers. They are teh most efficient. Don't buy some cheap beckett skimmer hoping to save a dollar since you wil generally need to buy another pump to run them.