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Welcome Shev,
The pick of the bunch would be the WO FLT 110. If you can get one with TEC optics instead of TMB you'll never regret it. Actually the TEC versions of the FLT 110 sell second hand for much higher than the original purchase price! Keep in mind TEC used oil spaced, not air. The TMB optics are equally well corrected - still a very good instrument.
You'll also need to decide early on what you intend to image. The requirements for Deep Sky Objects (DSO) vs. Solar System (planetary) imaging are different. You should also take into considering the telescope and camera combination so you obtain the correct sampling (arcsec/pixel).
If you want to hit some DSO's and you've never done any type of imaging before, I would suggest you get started with a short focal length instrument. Demands are much less (it is fun and forgiving). With the monster focal length of an SCT, you'll be pulling your hair out and cursing why you ventured down this path.
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