re "bargains", when dealing with a reputiable supplier, midway and 0or widener's seem to qualify, though there are certainly others, "quality often turns out to be the best economy".
On dies, I have used RCBS for years, and have yet to have a problem with any of them. This is NOT a criticism of any other brand, but merely a statement of my experience. Dillon's Blue Press lists Redding Dies, which might say something re product quality.
I have used a Dillon 550 for roughly 20 years. It's a first class piece of stuff, though actually it is "semi-progressive" in that the operator advances manually, from step to step, rather than "automatic advance" as is the case with their Square Deal (pistol calibers only) press. Hope this helps.