A cordless drill and a countersink bit for the crimped primers. Or a Dillon Super Swage.
I've been happy with Lee dies, and in .223 I just their cheap "RGB" 2-die set (I didn't need a shellholder.) If you need a small-base die you'll have to spend big bucks for another brand.
You'll also need a case trimmer. I use a Lee, with the cutter/depth_gauge chucked in a drill press, and hold the cases by hand while I run the depth gauge into the table. If you don't have a drill press, chuck the Lee trimmer case holder in the previously mentioned cordless drill and hold the cutter/depth_gauge by hand.
"The only way to stop a bad guy with a gun is with a good guy with a gun"