Done - 550 ordered but will come in pieces 2 to 6 weeks behind in orders and out of stock on a lot
Good choice.
I've used a 550 for 30 years, and never felt the need to move up to a 650 or 1050, even when I was at 1000 rds weekly.
One thing that I consider a must have: one of the ball bearing guides for the primer slide/track.
You have to online (evilbay and others) to find these -Dillon refuses to improve their 550 primer system; I have talked to them
about this at shows; they have the Glock Perfection attitude. The 650 was supposed to have an improved primer system,
but now they've switched the 650 to the 550 system, and renamed it the 750. Dillon will give you free parts parts for life, I know.
But, the primer roller will eliminate several phone calls over the years. Their aluminum primer slide will gall and stick open after a while.
You can take it apart and smooth the pieces, and it will work again for a few hundred primers.
After installing the roller bearing, I've gone through several 5K sleeves of primers without a single sticking primer slide.
If I was starting now, I'd also be checking out the Hornady LNL system, but that wasn't around 30 years ago.
And, don't forget to get a Lee Factory Crimp Die for each auto pistol caliber (especially with Dillon's Flared mouth sizer die).