I don't see much need in you getting another 30 caliber rifle if you already have the 30-06 unless you already have a wide range of calibers to choose from. Which it does not sound like you do.

Personally I would opt for a larger than 30 caliber rifle for the moose hunting. Not that the 30-06 is a bad choice here either. But you may as well spread out the range of calibers. Does this particular rifle come in a 338 mag? That would be my choice or the new 325 WSM if it is available. No sense in building a collection of a bunch of rifles all falling into the same power range.