After doing all the possible dailies (as I know this is one of the better ways to get gold), what would be the better instances to solo to get more money / gain items to vendor or place onto the auction house?

I have a lvl 80 night elf hunter that isn't as well geared as I'd like (as I don't raid) and have had difficulties with mid-60s instances in Auchindoun.
I also have a fresh 80 human death knight, but haven't done any higher instances that Stratholme with at the moment.