Envoy isn't exactly poverty wages either with the signing bonus and retention bonus... You just have to watch for the 1st year FO to 2d year FO pay cut.
But I think you get paid more at Envoy as a 1st year FO, than you do as a 1st year Spirit FO.

If you have the 1000 SIC, you might even luck out and get that 3 month captain upgrade and don't have to worry about the 2d year pay cut, although you'll be junior for a long time as more senior FOs upgrade ahead of you.

If AA/SWA is where you're wanting to end up, make sure you tell Sandy that so she knows where to file your resume.

If you're really wanting a Dallas base, you forgot to consider Mesa. They have a DFW base.
But looking at your post history, it appears you already work at Envoy, so you should just put in a bid for a base vacancy. or displace to equipment that has a DFW domicile.