Still Having Problems Finding A skimmer

A few months back several of you replied to a post I made asking for skimmer
recommendations, and the majority recommended ASM, Aqua C, or Euro Reef. All
these appear to be in-sump designs. Because I bought a wet-dry system (which
will now only be used as a sump) when I bought the tank, I don't believe I
will have the space to use an in-sump skimmer. I'm pretty sure I will be
forced to use an external skimmer. Therefo

What brands can anyone recommend for external use?

Does anyone have any knowledge or experience with skimmers from
http://www.myreefcreations.com They have been recommended to me, but they
use something called a Beckett Injector instead of a needle wheel, and I
can't find any information on this technology.

Can anyone give me some help? I'm not going to quibble about the cost, since
this is such an important piece of the system...I just want something that
works well that is an external design.

BTW...why are the in-sump designs so popular? Are there certain advantages
to this?

Thanks and Merry Christmas!
Tim