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The others have said it all already.. but I think you'll really be pushing it (pardon the pun) to go 400x with an 8" dob. The conditions would have to be really good to allow that magnification.
Most times you'll be working between 90 and 200x, and tracking/nudging isn't difficult.. it's not like your constantly moving it.. when it gets to the edge you swing the scope to align it back to the other edge.. and once you get a feel for the direction it's travelling it's quite easy to predict where it'll be even when you overshoot it sometimes.
And as the others said, keep the alt/az motion smooth by using milk bottle washers, replacement teflon pads or super sliders, ebony star or other mods that will ensure the movement isn't "sticky".
oh btw johnno, are you coming down to the May 7 star party? Brendan (also from around your area) is coming..
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