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Hi Simon,
My first inclination would be to say, "Get only a f/7 flat-field focal reducer and T-ring for the DSLR."
With 30 second subs, you can get away with imaging on an Alt-az. Field rotation will be bearable. I routinely use 30 sec subs on an alt-az LX90 with an FR.
You will lose some subs due to mount inaccuracies, although my LX90 ACF is a real performer in this area and tracks unguided quite well.
You will gain by having 3 minute GOTO alignments rather than multi-hour drift alignments.
You will pick up good objects, and stacking will get you a long way down the trail.
Once you have worked out the limits of your setup, then it's time to do more shopping. But don't sell the LX90 - it will work for you when that shiny EQ fails to align or goto properly, or does meridian flips ... believe me, plenty of people have gotten into astro by steps, but very few can put down the required cash in one huge spend and then get what they really want.
Hasten slowly.
Regards,
Tony Barry
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