Steve,
If you aren't sure about eyepieces then stick to say 3 cheap ones for now, on the basis that later on when you know more, maybe buy a set of really good ones after you have had the chance to borrow a few to see
which ones you like in your scope. Different observers have different preferences and what works well in one scope doesn't always work well in others.
For your dob a set of 3 Plossls are a good start and will cost much less than a good zoom.
As for... zooms.
This
http://www.cloudynights.com/item.php?item_id=2146
and
http://www.cloudynights.com/documents/zooms.pdf
cover all the zooms made in recent years. The Leica, Nikon, Televue are probably the best, in that order. The Vixen and Baader ones will probably have you reaching for eyepieces.
In principle the idea is to cover the range 8-24mm, equivalent to 3 eyepieces. But with zooms, the compromise you make for this is narrower field of view and more glass (weight and light loss) than in good widefield eyepieces.