While I think any of those cameras are great, Full frame is great especially for you with the landscapes. Go with what makes you money...
I think a 70-200mm should be plenty fine for concert shots with a full frame, if you need more, get closer! Plus with that size you can cropcropcropcrop.
I'm very jealous you're going full frame, the 5D is a very nice camera. Does the grip increase the buffer? I know with Nikons adding a grip ups my D300 from 7 to 9 shots per second.
For the record, it goes from 6 to 8 fps, but only with 8 AA batteries or the Nikon EN-E4A (~$400 for the battery, charger, and battery chamber cover). The normal EN-EL3E in the grip doesn't increase the speed since the camera needs 11-12V. Also, I'm pretty sure it does not affect the buffer capacity, which is determined by the shooting modes and settings.
Of course the only application I've had for 8 fps so far is, "Hey, listen how fast this freakin' camera is!"