I was going to get a Euro-Reef 135 for my 90, but after I dry-fitted the sump and measured, there was no way the ER would have easily fit w/o doing a lot of plumbing magic. So now I'm going to get a Tunze 9010...very small footprint, short, and seems to be a powerful skimmer.
Bottom line...measure before you buy your skimmer as a lot of these skimmers are really tall and may not fit in your stand.