Ok, ok, I'll try to be the nice, objective guy. So, firsttimer, when you do a search, you will most likely see the following opinions:
DL1000 - One hell of a machine
DL650 - One hell of a machine
The subtle differences, based solely on my reading of this and other forums, as I own neither bike:
DL1000 - More power all around, a bit heavier, a bit less nimble, better for 2-up touring and long highway miles, less off-road worthy but still capable.
DL650 - Less power but more than enough for 99% of the owners, a bit lighter, more nimble, still capable of 2-up touring and highway miles, more off-road worthy.
Keep in mind that neither Strom is an off-road bike, though many people have taken their Stroms to hell and back... AND got the T-shirts
Hope this kinda helps, but yes, do a search