i use all three of the dies you mention and they are all fantastic...the lee collet die is IMO the best die to use if only neck sizing...buy 4 extra mandrels and you can hone them down for different neck tensions.
the forster is the best FL die next to a custom because once you figure out your loaded neck size you can send the forster in and have the neck honed a few thousandths under so your not over working the necks and have custom E-10 expander balls made so you can adjust neck tension...and the best thing is all 3 dies are reasonably priced.
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