Jerry:
You know, man, there are times when you have to bite the bullet (as it were) and pay the going rate for a piece of fine equipment. It was kind of like my taking my SO to the jewelry store and saying "...OK...pick what you want. Your budget is X dollars" and after two days of shopping this store hard and looking at everything that interested her, she found the one and only necklace for X+ $250. I didn't want to pay that but said OK. I have not regretted it once since.
The 550 (and probably more so Dillon's company) is a wonderful piece of equipment. I just set up for 223 and loaded in excess of 3000 rounds over a week. Set it up and go to town. I'll change over to 44 mag and load a bunch of 240gr cast lighter loads, maybe 1000. That is how I load - manic sessions over a week or more.
I know it is easy to spend other people's money, but in this case you really SHOULD go with the Dillon. Save a little more and go for it. Not only is it a great piece of equipment, their no BS warranty is just that. I have virtually rebuilt this press over 25 years and it has not cost me a penny.
Please believe me on this one.