I went gold at 100 on my crew, but regretted doing so. If I do it again, I'll likely gold the dps around level 80, caster crits adds way more dps than you would think, will really save you a lot of time. BST focused paragon really changes what you can do with the bst over a grind session, etc...
I'd go as long as possible without it on the tank/healer/ench though - if your group is staying alive, don't worry about it. If your having trouble with current content, do the tank first and see how it goes.