If you're willing to go older and high-mileage, you can score a DL650 for under $3k with some patience. I paid less than $3k for my '04 last year and would do it again without a second thought.
If you're going single-cylinder, I vote for the DR with an aftermarket tank, and this is coming from someone who owns a KLR. The DR is better off-road and not that much worse on-road except for its lack of fuel. Add more gas and the DR is clearly the better bike if you ride a fair bit of dirt.