Consistent length to bullet ogive is one of the most important variables in precision loading. (Obviously, you need a good calipers and a caliber-specific comparator). Some people can achieve this on a progressive press, but I can't. I use a single-stage for all precision rifle loads.
The annealer is a good idea if you will be loading your cases more than 3 times. It's not just about longevity of the brass. Consistent neck tension is important for consistency.