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The TS Optics you mention is actually a rebadged GSO Classical Cassegrain 8", f12, as sold in Australia by Andrews. I have one of these, and it is a fine planetary scope, and I am presently studying Jupiter and Saturn through it as they approach their near simultaneous oppositions with earth in a few weeks. There is also a new 10" Truss version of this same CC design, but couild your budget stretch that far, and then you need a good mount, minimum a CGX, so together that is getting up over $7k. Big SCT cost even more and all the usual drawbacks of SCT, like mirror flop, crappy focusing, fogging up, etc.
I would forget the Skywatcher EDs you mention, mostly because they are too short for serious planetary work, and they have colour fringing issues.
If you do have a large Dob it might be fine for planets with a good 2x, 3x etc Barlow lenses before your eye pieces, or a Paracore, cheaper than buying a new scope that requires an EQ mount.
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