My favorite case prep tool actually is the mini lathe, even though I have some of the standard others (Hornady, Lyman, and RCBS). The mini lathe can perform just about all case prep activities, plus a ton of other work around the reloading bench. Example, I custom make all my mandrels to fit sized cases that exactly match the expander ball in my sizing dies, I find most factory mandrels too loose, or tight, also, my mandrels are made a little longer to align the case more accurately with the cutter.
Some may say that this is an overkill for case prepping, but price out the new Hornady LNL Case station and you'll find this is a much better deal for a few more bucks, considering its capabilities vs the LNL
The lathe pictured here is a CMT Mini Lathe 7X12... a great tool for any shooter/reloader.
Check out the link below for some great reloading lathe projects.