Nobody can answer your question.

I am guessing you are from the east cost. If I were you my first choice would be XJT. I'd also apply to CHQ for the (hopefully) quick upgrade. (You need more hours for them though). If you can relocate to the west coast then also apply to Skywest. You may upgrade really fast with them in the turboprop, and then wait until you can move to a jet.

Anything else at this point is a really tough choice. Colgan can work out ok if you upgrade and then get lucky and get hired by a major. In fact that may be your fastest way to a major. The downside is that if you don't get lucky then you'll be stuck in a prop.

I think you have the right idea about deciding first where you want to go. There is no need to apply to companies such as MESA if you have no intention of ever working for them (and you shouldn't). Apply where you want to work and then stay put – being a CFI while building more hours is not bad at all considering all options.