Buck Board,
I got some Lyman dies for my 45-70 over 20 years ago, when they were the only ones I could find. I've used the heck out of them, and had no trouble at all. I have some RCBS dies which I've had for about five years for my 45-60, and they work fine, too, so I guess it's a toss-up as to which is better. Yes, reasonable price IS a consideration. Good luck on whatever you decide.
Dave