What version of the Dyna are you getting? A superglide sport with more accessories hanging off it than a bagger is currently infesting my garage. I'm a pretty big fan of the Dyna line (except for the wide glide, which feels a little chopperish to me).
I'm going for the Dyna Low-Rider, if I get one at all. I'm still not convinced it's a good move.
Right now I have a 2001 Sportster. I'm leery of the added weight, even though the Dyna sits lower and is more stable (I'm told.) The Sporty is topheavy.
I may just go with a new Sporty, now that they've moved and rounded out that blankety-blank battery case.
Talk about different strokes. The Wide Glide is the only Dyna I halfway like. The Lowrider is far distant 2nd.