[Tate]

Get at least a 4" size so you can measure cylinder bores and main bearings too. I'd look at getting individual mics like you are doing. I've got a 0-6" mic, which I hate changing anvils on when you're not finished measuring that size, and you always have the chance of it being off a little bit when you put them back in.

I'd always go for a Mitutoyo unless the Starrett is super cheap. I hate the feel of Starretts, always stiff and heavy.