Here's my take on the whole thing. First of all it doesn't matter where you want to be in 10 years, corporate or 121. At this point of your aviation career all you need is experience, i.e. FMS, glass cockpit, CRM, advanced system knowledge etc. All of those thing will get sitting right seat in the sim. Not to mention meeting people from all over the world who are potential employers. Airlines will still be interested in you once you get their mins and you will have more to offer them as compared the other 500 hour guys who have only been flying pipers if that's the route you decide you want to go.
You said you already have a CFI, so keep instructing and working at simuflight to get experience and make contacts along the way.
As far as program. Take the best airplane they offer you. You will sit in the sim longer and build more time as a CFI for a GV job as compared to a king air but it will pay off in the future believe me, I have seen it happen.
Take my word on this i started working at flight safety in Wilmington Delaware once I got my commercial multi on the hawker program. All my other friends didn't want to do the program because they didn't want to fly a computer and now most of them don't have there regional jobs anymore and I got a job flying a hawker 800xp and a Gulfstream 5 with a part 91 corporation making 4 times what the regional guys start at by making contacts with people I worked with in the sim. And by the way try to get into flight safety Dallas, pay starts around $15/hr! Good luck, let me know if I can answer any questions you may have.