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If you're already considering a Lodestar/ST-i, how about an off-axis guider too? It will make guiding easier at the RC10's focal length. I have an ST-i and Lodestar, and have no troubles finding a guide star anywhere in the sky using 0.5 sec exposures with an OAG on my RC8.
I'd recommend thinking carefully about throwing an ST80 on top of the RC10... you may run into flex issues.
For what it's worth, I find my Lodestar more sensitive (I use 0.05 - 0.1 sec exposures for adaptive optics) but the ST-i's built-in shutter is an awesome feature. Some guiding software, such as MaximDL, is ridiculously over-sensitive to hot/warm pixels and so automatically re-taking dark frames every time you start guiding is fantastic. (I normally use my Lodestar, which works fine with a dark library - it's just a bit of a pain to reshoot the darks occasionally.)
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