The best conversion system I've used for swaging is the adapter kit for the Hornady Lock N Load. It runs pretty quickly and provides a very consistent swage that allows for easy priming. Converting the Lock N Load for swaging is pretty easy. Down side is the kit is only available for 223 or 308.
Not to steal Lee's thunder because I do think this new press is pretty cool and I'll likely end up with one for rifle brass prep. But I had no idea a swager was available for the LnL. Can you tell me more about it or direct me to where to see it online? I assume you pull out the primer punch and screw in a swager.