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Suavi,
I get where you are coming from. I enjoyed my time with refractors but then I started wanting more aperture. The RC is good and has produced some nice images but then I thought about experimenting again.
I have learnt an important lesson regarding fast Newtonians, my previous experiences with Newtonians were an f7 in the 1980's and an f4.5 in the early 2000's, but an f4 and faster are a different kettle of fish. I bought the AG12 in a response to the problems I had worked with in the GSO 12" f4. I'd recommend a very careful selection of an f3 scope. I cannot at this stage make comment about the AG12, but I have seen enough good images from them to see they have a handle on mechanical issues.
I guess ultimately it depends on your budget but they get awfully expensive if you want stable.
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