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For imaging on a 13" cassegrain, and "excellent tracking at high power", you are looking at a minumum of a Losmandy Titan IMO. The G11 or less wont cut it (unless you get a light carbon tube OTA). Dont understand the adversion to Goto at that level, its going to be very difficult without it, and anyway, the drive system will need to be so good that Goto is a relatively inexpensive addition. You will need some control electronics anyway for guiding, the goto contoller has that built in (and PEC).
You seem to have high expectations for imaging (oops, is that what you want to do, or visual?), but the mount ideas you have dont match. The mount is simply the most important item bar none, a rethink, yes?.
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