750XL. It will eat all your components. It is revelation in .223. I size with lube, case tumble them clean, cut to length, deburr, and drill primer holes. Once you get that done, it goes really fast. The best part is the press primes the cases without any drama. I use a ball powder in .223 for slick operation. It spits out 9mm too by the bucket. The 550 you have to turn the shell plate each time and the 650/750 turns it for you. Very nice. It is designed to run with the automatic shell sorter which is pricey. I bought a six tube shell feeder from Titan that works almost as good for maybe $75. I have loaded over 6,000 shells in two and half years. 9mm. 223, .40 and 10mm.
I may buy a second one for .308/.30-06 although you can get any shell plate. But one set up for small primers and one for large is ideal.