Today, Open Road Media releases e-book editions of a number of Samuel R. Delany's best books. I've had the chance to look at the Kindle edition of Dhalgren, and it's really excellent. Indeed, it looks to be the most accurate text, incorporating the corrections to errata in the Vintage editions, which were, until now, the most accurate.
The other Open Road editions (which I haven't yet seen) are: Babel-17, Nova, Stars in My Pocket Like Grains of Sand, The Motion of Light in Water, and the four Nevèrÿon books.