Tough choice, but either the D or DS are really nice cameras. I have both. As already mentioned, they both support ttl flash....something I really like. I tried the DL2 for a while....(actually it was the samsung version gx-1L) and just didn't like the p-ttl flash. Seems the pre-flash always resulted in one of my kids eyes being closed in the image. Thus, it was short lived in my bag.
As mention, the D is a bit sloooowww
but unless you like to fire off several frames in rapid succession, you learn to adapt. With upgraded firmware, you can use 4GB cards. I even have a sd/cf adapter and can use my sdhc memory cards.
They do fit differently in your right hand too....the D is a bit more rounded where as the DS has a slightly sharper edge to it. (is that a good way to describe it?)
Anyways, both will give you nice images, and are lots of fun to use.
Best of luck.
-mark