I agree with Geoff, collimation is collimation - you'll need to do it with the 8 or the 10". Once you learn to do it well, you'll want the extra aperture.
The only thing going for the f/6 is it's a little less taxing on the eyepieces, so some budget widefields might do a bit better in the f/6 than in an f/5. But it depends on your expectations, and tolerance to star shapes around the edge of the view.
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We're off to Sydney next weekend to do a little shopping so we'll see how things go
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Can you make it to the observing night on the Central Coast on Saturday night?