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You seem to be getting the wrong end of several sticks Chris.
As Russ said,the focal length of a scope dictates the length of exposure that you can use without getting star trails.
I assume that your 8" is f/5, 1000mm focal length. That allows about
half a second near the celestial equator, and around 2 to 3 secs near the celestial poles. Pretty useless, I think you'll agree.
The 14" has a focal length of 1650mm, so simple maths show that the useable exposure time will be substantially less than your 8" allows,
[with the motors turned off, of course]. When using the Go To you will
still of course be limited to well under 30 secs by the aforementioned field rotation.
As Russ pointed out, I'm pretty sure the Go To dobs don't have an
autoguider input socket, as they are not designed for astrophotography.
The 6SE is a Schmidt Cassegrain not a Maksutov. It is f/10 giving a
focal length of 1500mm, so it also would allow much shorter exposures than your 8"[when it's drive is turned off, of course.]
raymo
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