Wow, I've been off the site for a few days. Thanks for all responses guys, I appreciate the input.
I have been on ADVRider and other thumper sites for a while soaking up info; I really wanted to get the opinions of folks who have ridden both the SV and DR, hence my rationale for posting here rather than ADVRider.
I'm looking more toward the DR than the KLR for two main reasons:
1. air/oil vs. water cooling (simplicity, 'bullet-proofness')
2. DR is slightly more shaded toward dirt use; Intel Killer stated perfectly my mindset at this time:
'The DR is for riding to the trails that you want to tear up. The KLR is a pavement / adventure bike in that you might discover some fire roads off to the side on your normal ride.'
3. The weight difference is also substantial
Reasons for DR over DRZ:
1. DR generally better suited for road use
2. air/oil vs. water cooling
3. DR is slightly better suited for 'one bike status' should the SVRat give up the ghost.
I am looking to expand my riding opportunities rather than replace a road bike. I have no doubt that I will continue to pile up my fair share of road miles, but I'm hoping to do much more exploration of unpaved surfaces than I do currently. My single greatest fear is that I will be completely underwhelmed by the DR on the road given the available power of the SV; I'm no speed junkie, but the question still lingers.
Thanks again for all your thoughts.
[edit: Had also considered the XRL and XChallenge but eliminated due to price point.]