If you want something well built, then ATB and Royal Exclusiv are excellent choices, but they are extremely expensive (mostly due to the fact that they're built in either Austria or Germany, not China or DIY), worth it if you like having high-end toys that are built to last.
I have an ATB 840 v2 on my 120, and it works like a champ. I would encourage you to seek out an ATB skimmer, but to be completely honest, I think they're now overpriced, and I worry about the future of ATB, especially in the U.S.. Two years ago, when I bought mine, there weren't many worthy competitors so paying a bit more made sense. Nowadays, there are a lot of choices, and while ATB is still a good choice in terms of quality and reliability, their prices don't reflect what's going on in the skimmer industry. Some of the Chinese knock-offs are actually decent and remain competitively priced, and are more technologically advanced than ATB (at least to what's currently available to the U.S. market). I don't think they have a solid U.S. distributor anymore so getting them may be more difficult, as will service and ordering/receiving replacement parts. I've seen quite a few demo ATB units, some of the newer ones with DC pumps, but I haven't seen anyone in the U.S. selling them.