I used to bow hunt some and worked at an archery shop for a couple of years. It depends on your budget as to what kind you want to get.
A plain bag target is good for field tips, but no broadheads. It's also pretty inexpensive.
The compressed foam targets (the cube type) are a little more expensive and durable. You can also shoot broadheads into it. This is the one i would go with.
The deer targets are expensive and not really necessary in my opinion.
I know you said you didn't plan on practicing with broadheads, but I always sacrificed a couple for practice just to be sure they'll fly the same as the field tips do.
Hope this helps.