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With guiding you'd probably find that the CG5 is entirely adequate for long exposures with an 80mm refractor.
The refractor would be the most painless option - just focus, apply a dew strap and it won't give you any grief.
The TS 80mm fpl53 f/7 doublet is a good scope and its price keeps you under the gst limit. The TS72 fpl53 doublet that I have is also good and cheap but even more widefield. The focuser on these scopes is a good 2.5" R&P.
TS sells a 4 element 0.8x reducer to suit these refractors.
Similar scopes are sold under other brands such as Astro-tech and Stellarvue.
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