Another plus for the 650....although for alot of reasons I would get the new 750. The priming system is like the one on the 550's and a lot better. I get very good consistency priming my 6.5 and .223 cases using that priming system on my 550.
The auto index is better on the 750 as well.
Theres a lot of guys making good match ammo on 550's and 650/750's so it definitely can be done.
I really think the 750 fits what you're asking for with case feed and auto index being the biggest additions that are going to save you time. Bullet feeders are a nice upgrade, but IMHO do not significantly increase efficiency. In the time it takes your arm to work the handle, you can have a bullet ready to go in your other hand, throw it on the case and not even miss a beat, As you have to prime anyways.
With match ammo, you're going to want to slow your whole process down anyways, and get good consistent pulls and primings, so you're going to have plenty of time.
Once you get your setup, I challenge you to take a load you know will shoot well, make 25-50rds like you normally would, and then make 25-50rds on the Dillon and see if accuracy or long range performance suffers.