Having worked at CommutAir, I wouldn't recommend it to anyone...it's a bottom of the barrel regional. Their ALPA-negotiated contract is weaker than PSA's concessionary contract. The same people who preach you'll regret working at PSA are the ones who claimed working for GoJet would ruin your career, which obviously hasn't panned out.

A regional is a regional. Get in, get your time, get out ASAP.

Always go for the place that's easy to get to. It doesn't matter where you go now, you're getting an ATP, a type, and multi engine turbine time. Never, ever chase an upgrade. Take the place that let's you drive to work; whether it's PSA, CommutAir, GoJet, or Eagle.