Hey there,
my new multi-class team just hit 60 today so I'm in this boat too.
I don't like questing so much. Always feels like jumping through hoops for rewards, to me.
So I'm boosting. I'll keep in touch with what I've found so far.
www.wowwiki.com/instances_by_level is my friend. I decided for the lulz to drag the team through a boost of Shattered Halls. They got the achievement, but the team only got 28% of a level out of it and it took a lot longer than ramps would have.
Ramparts elite mobs give about 610 per kill. S-Halls guys gave 732 per kill, but were 10 levels higher so took forever to kill.
I think if you're using a lock and priest you'll be able to manage pulling a mob or two at a time, using the lock pet to tank. I think the damage it takes in Ramps will be trivial.