I'm not sure what the demand out of ELP looks like overall, but the distances that you have the F28s flying will be barely proftiable for you at the higher end of their range without a fuel stop. I also see you have routes flying between 0000 and 0500. Starting with 1.2, there's a pretty significant penalty if you're taking off and landing in that time zone.
With regards to your DC9, unfortunatly, the MD-81s are bigger and have better economics at about the same lease price. If you watch the market they're usually pretty easy to pick up. If you're flying 1500nm, you want at least room for 150 pax.
So, I took a quick look at demand to the top 10 US cities, and it really isn't all that great. If you can build up enough to open a base elsewhere, thats certainly possible, but overall, I think you'll have a tough time with the demand level there.