based on needs, definitely Dillon...
550 would be first instinct, but I absolutely love my 650, and have had a few 650s before I started upgrading to 1050/1100/2000s. Not a huge fan of the 750, with all the primer feed issues Ive heard of, and i understand some people dont like the 650 primer system, but ive had very few issues, as i keep mine clean/maintained.
Definitely blue though, no matter which model you choose