I've been hearing good things about the DMT8EE, things like "cuts as fast as the norton 4k, but as fine as the 8k". I've got one on the way because these guys: http://www.craftsmanstudio.com/html_p/T!D8.htm have them for less than I got my 4k/8k and since it's diamond it should outlast the norton (not that I'll live to see that day, but it's the principle).
I'll have to experiment and report back, but if the rumors are true, the DMT already wins for convenience because there's no flipping the stone, no soaking, no lapping, no possible chipping/breaking. And if the performance is even close to what it should be, it's a done deal.
But I'll keep both either way.