I'm in the same boat. I have been doing alot of research on skimmers. There are alot of different opinions out there. From what I have read, Becketts are good, but require quite a bit of tuning, and require a high pressure pump to drive the becketts. They are supposed to work very well on large tanks, and are good at wet skimming. There are some newer re-circulating becketts out, you can check them out here
http://www.myreefcreations.com/psstandard-r.htm Barr aquatic is reported to have some very nice beckett units, however Brent sold the manufacturing off to a different company, here is their site
http://www.austinoceans.com/index.html#pumps
I can't comment on their quality, but I believe they are using Brent's designs.
Re-circulating NW skimmers seem to be the new buzz in skimming. The NW pumps usually consume less energy. THey are definitely more expensive than the beckett units though. From what I have read the Deltecs, Euroreefs, and Bubblekings have great feedback. I personaly cannot afford to spend 2500.00 - 5000.00 on a skimmer though. I have not done a cost comparison as far as energy consumed vs cost of NW. I don't have any experience with either design, I have an Aqua-C, but will probably buy a MR-6R from Andy @ MRC.
From the post Ive read, both designs are very good skimmers, and each have their drawbacks/advantages.