Wow, a question I feel somewhat qualified to answer. Stay and get the turbine PIC. (Assuming you're not just a typed FO logging it.) Once you've got the PIC, attempt to branch out and find a better 135 or corporate job, consider trying the regionals, or even the fracs.
It's very competitive right now, and not a lot of folks (From any background) are getting the call. That being said, once you've got the turbine PIC, look for ways to add to your qualifications so that you are the most attractive prospect you can be.
I myself am leaving the well-paid world of on-demand part 135 flying for the schedule, structure and newer aircraft of 121 flying. (Regional) I've got almost 2500 hours of turbine PIC, another year and 350 hours isn't going to do much extra for me. Adding some 121 experience to my resume however, should help. (I hope) If it doesn't, then I'll have a nice place from which to retire someday. As much as I love flying the Learjet, the same cannot be said of my current job. (Too many years of pager living) For example, I was recently doing a HOU-TXKF-CLT-ASL-HOU thingy, which started at 2200 after I had been up all day. So, it's 0430, we're 180 miles from Bermuda headed to Charlotte, and just about to loose NY on the VHF, when the paramedic taps me on the shoulder, tells me our patient is crashing, and says he needs a sea level cabin immediately. We ask for and get FL 240 from NY just as the VHF is dying, descend and level. Now we've got thunderstorms in front of us that we're going to have to deal with, the HF isn't tuning up, and I'm manually recomputing my ETP and PNR for the 5th time this trip and the sky behind us is getting light. I've been awake almost 23 hours. I think to myself: "It's really cool that I'm able to do this stuff and make it look easy, but I'd much rather be in bed or just getting up after at least a FEW hours of sleep.
So, I'm looking very forward to the regionals. Some of my peers think I'm crazy, but time will tell.
