I've not had the chance to look through or image with a Megrez, but depending on how much weight you put on each of your requirements, the Zenithstar may or may not be good for you. The focuser is solid...I've never experienced any slippage, and with a fringe killer you can keep the blue halos minimised.
But I can't help thinking a triplet would be better all round for a little more $$. For example, the Orion ED80 triplet seems to have a good reputation. It's small, light(ish) and well corrected by all accounts.
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