Figured I should give an update just in case anyone is in a similar situation to me...
What I ended up doing is ordering a Honeywell Lyric Security panel kit from an online dealer and installed it myself, it was pretty darn easy install considering. There's a separate monitoring cost, but it's less than 20% of what my local "pro's" wanted, and it provides ALL the functions.
It also has a built-in ZWave, and I was able to get my SmartThings Hub to recognize it as another controller, but they don't "talk" to each other as far as I can tell, at least I have not found a way to get a status of the alarm or anything (yet).
I wont' go into all the details but the Honeywell Lyric is pretty nice and it was easy to setup after watching a couple youtube videos. You will need central station monitoring in some form with this system though. However, considering that if I was paying the monitoring rate from a local company the system will pay for itself inside a year, I'm happy happy happy!
Now that I finally have my SmartThings hub, buying ZWave devices has become something of an obsession. I currently have Leviton Decora ZWave dimmers, switches, and fan controllers and I have setup my Alexa and Stringify and IFTTT accounts.
Right now, IFTTT and Stringigy are the "glue" that's binding my Nest Protect, Samsung Refrigerator, SmartThings, Alexa, etc. together.
So I feel like I'm well on my way to getting things more to the way I want. One example: of my next mini-project, install the Fan Controller onto my bedroom fan and setup IFTTT or Stringify so that if the multi in the bedroom temp rises above X turn on the fan until the temp falls below Y . I was always told that "fan's just move air / fan's cool people not rooms" well I proved that wrong, my multi started out at 80F (2 story home) and I turned on the fan, and after a little while the sensor was down to 72 again (same as the rest of the house).
So pretty cool stuff on the horizon.
EDIT: realized I didn't update on the sensors used for the security system... I replaced the 3 door sensors with the Honeywell ones, and I purchased a wireless to wireless translator from Revolution Products. This allowed me to re-use the DSC branded window sensors (22 of them) with the honeywell panel. Works great!