It somewhat comes down to what your needs are as well. Do you need a side bolt release, trigger hanger, etc... most 700 actions will need some work and if found at a reasonable cost, can make sense on the right build.
I still have 2 Rem 700s that are really nice and worked over. But I do think something like the new Mack Bros SS action for $575 is going to be hard to beat for the money.
