Nelson,
I would go along with Bill
Also the difference in price between a 0-3 and 0-6 is sometimes quite small.
DaveH
Big will do small but small will not do big. Again this depends on what you expect to be machining. If it were my choice I would go for 0-6 inches.
It is better have and not need than to need and not have.
"Bill Gruby"