for the bushings. As for the best dovetail jig, I don't own one but those that do, swear by the Leigh jig. Kinda pricey ($499) but you did say the best, plus add on the fancy options at $250 per template and you'll have a tidy sum tied up.
Porter Cable also makes a nice jig (~$350) but it doesn't have the same capabilities that the Leigh does. Another is the Incra jigs which are also pricey but nice from what I've seen. Personally, I got me an Independence dovetail saw and a set of Marples chisels and a doohickey dovetail layout tool from Lee Valley. Course I'm just a hobbyist so making'em by hand is part of what I enjoy doing. Mine look hand-made too.....;-)
I used a brass bushing/ring from Woodcraft (labeled for the Porter Cable router) in my DeWalt 621 (for a shelf hole jig) and the bushing and locking ring fit the router perfectly. Sorry for the lengthy URL...
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