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Thanks for the advice everyone. I think the consensus here is spot on and 1.3"/px is probably not going to cut it. Having said that, I don't know how low I'll be able to go here before I become seeing-limited.
Last night I took a couple of captures of M83 again, this time at 1.04"/px. When I consider that most galaxies I see in Stellarium are around 2' and M83 is ~11', even 1.04"/px might not be enough.
For some reason I had terrible guiding last night... usually I'm getting around 0.65 rms lately, but it was up as high as 1.16 last night, with DEC corrections seeming to have no effect at all.. and then I noticed the objectives were dewing up and then I packed up. If I can get guiding back to normal I think I might be able to handle the 900mm and so I might just keep that for now.
Tip for anyone in the market though... WO apparently have a GT102 they've been using as a demo that should be available for a good price... they advertised one a month ago and that's sold, but this current one hasn't been advertised so get in quick if you're keen...
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