So far my lighting equipment consists of one Minolta 3600 HS, I'd like to add something to enhance light coverage for more portrait use (multiple people/groups). I'm used to using a few white lightning x800's at work (which are strobes of course). What major differences should I expect from a continuous light source? Can I still expect good light coverage at f9-f11/ISO 200? What kind of kits are good for starting out?

Thanks in advance.