Ah Bortle 4 skies, that must be sweet. I have to get on an airplane to get to Bortle 3. For your skies, a 12" upgrade might as well be the better idea.
Since your 114 reflector is F9, it won't do for EAA. And getting started on imaging/EAA with an SCT/Mak is really discouraged. Even with an F6.3 reducer a C6 (I own one) ends up with 945mm FL which is quite long for imaging, demands better tracking, limits you to the smallest DSOs (galaxies and small planetaries). People who do EAA with SCTs like hyperstar (expensive but F2) or the F3.3 reducers, but those comes with their own complexities which are best avoided when learning imaging.
So, back to the dob upgrade, all the advise I can give is:
Consider your transportation needs for getting a larger dob to those Class 3 skies you have easy access to. If you own a truck you can have anything, but on a sedan, a solid tube 12" may not fit. if that's the case (or you want to drive with a passenger) then consider a collapsible skywatcher or a truss Explore Scientific.
If solid tube is ok, then you're probably best hunting the classifieds for a while until the best deal shows up.
Thanks for the info Adun, In the future I may look into getting a imaging scope for my goto mount. I have a Chevy Silverado so I can just about anything solid or truss haha.