The answer to your question is a definite yes.I too shoot between 15K and 20K/year.
I'd go with either the 550 if like me you don't like the auto index or,if you don't mind it,go with the 650.
Why go with Dillon?Yes,they are more costly than Lee but they last and last.My RL 300 dates back from '82 and I've never ever had a single problem with it.I can't say so much about my Square Deal B.But Dillon has always been there to send the parts to cure my problems and always with a smile and at no charge.
They stand behind their product.