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I have the SW600 but on an EQ5 (a few sandbags on the accessory tray help dampen down any wobbles) with a dual axis motor drive.
I have recently upgraded to Baader Hyperions which seem to perform well even at f5, to my very beginner eyes. They are really crisp on planets, and I find that the reported 68deg FOV give me reasonable views on DSOs. I confess that I did purchase the whole range of Hyperions (from Andrews) and do not use them all. I also have a 2x barlow. The 3.5mm is just at the edge of useful mag for the SW600, but fine on a night of good seeing and viewing.
I agree that a Barlow and 2 or 3 EPs are really all that you NEED, but it always fun to have other mags to play with, particularly with varying viewing conditions.
What I did when I was deciding which pieces to buy I made myself a little table (on microsoft word) incorporating the mags and possible mags with the Barlow, calculated the highest useful mag for the scope, and made unuseful mags red as they were not wanted...then looked at which barlow / eyepiece combos overlapped closely to show superfluous combos. I then did a bit of reading to find suggested mags for planetary viewing and took these numbers into consideration also....but in the end I like toys and bought the lot anyway. As I said I dont use them all.
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