Your not going to like what I'm going to tell you, but IMO once you get to a tank size of 125 gal, a HOB skimmer is really not a good option. They just are not large enough to do the job.
The question is now do you really need a skimmer? Some systems don't need one. It's very dependent upon what you keep in the system and the demands on the filtration system. Alternatives to skimming include algae scrubbing, but while good, does have some other considerations.
The other question is why do you hate sumps? Perhaps you had a bad experience or other problems that can easily be resolved with equipment available today. Tell us more about your current system, including the filtration system. If your still planning the system, then tell us about your plans.