Dillon's 550B is my choice. It always gives sub one minute 5 shot groups and is fast. Case prep is what takes all the time.

I am a one at a time loader, myself. RCBS RS3, been using it so long they make a RS5 now. I used a RCBS Uniflow powder thrower for years, there was an article in Precision Shooting on powder meters a few months back. Most of the sit down shooters use a Harrels (works great), at the end of the article the writer said that a 20 dollar Lee measure worked just as good as the big buck ones.