At that price point, the Dillon 550 is a good buy, BUT you will throw a couple hundred more at it in parts.*
Quick check on eBay, they go from 390 to 450, or thereabouts. Used and BNIB.
Would you know offhand if it is a Progressive or Manual Indexing? If it is progressive, with a couple hundred bucks worth of add-ons, you can pump out any caliber pistol ammo (just about) at a rate of about 150-200 in 20 minutes or less. If it is a manual-indexing, in other words "turretted", your tops would be around 150 or so in 20 minutes.
Do you know what else is in the box, in addition to the actual press itself?
* For comparison, Hornady Lock-N-Load progressive reloader kit (lacking only the digital weighing scale to adjust your powder charges and the case trimmer, as well as the dies themselves and a few other gadgets) can be had on sale at Scheel's (
www.scheels.com) for about $350. It is the same kit for sale at Midway USA here:
http://www.midwayusa.com/product/679228/hornady-lock-n-load-ap-progressive-press
An RCBS single-stage reloading kit complete (less digital scale -it comes with an analog scale- and case trimmer as well as the dies) is available at Cabelas on sale for $270 or so, but it is a SINGLE-STAGE press, so your productivity drops to about less than half of that of a progressive or turreted reloading press. It is available for viewing here:
http://www.cabelas.com/product/Shooting/Reloading/Presses-Dies%7C/pc/104792580/c/104761080/sc/104516280/RCBS-Rock-Chucker-Supreme-Master-Reloading-Kit/728426.uts?destination=%2Fcatalog%2Fbrowse%2Fshooting-reloading-presses-dies%2F_%2FN-1100195%2FNo-0%2FNs-CATEGORY_SEQ_104516280%3FWTz_l%3DSBC%253BMMcat104792580%253Bcat104761080%26WTz_st%3DGuidedNav%26WTz_stype%3DGNP&WTz_l=SBC%3BMMcat104792580%3Bcat104761080%3Bcat104516280
I have been using RCBS Rockchucker Supreme (what Cabelas is selling) for over a decade now, and have fine-tuned my reloading routine so that the cases are all prepped and primed before I actually start loading powder and seating bullets. I can pump out about 100 rounds in 30 minutes, but I've been doing it this way for years now. If I can justify throwing more money to "fix" something that is not broke, I would buy the Hornady progressive kit.
My $0.02, hope it helps, Mike.