That kit lens in my experience will work for wide shots (at 14mm) but not good for a shallow depth of field due to low aperture (3.5-5.6). That pretty much applies to most kits lens really. In addtion to the 14-42mm I own and use:
Minolta AF 50mm 1.8
Minolta AF 70-210mm 4.0
Minolta AF 28mm 2.8
Minolta to micro 4/3 adapter
Of all my lenses though, I use the 50mm 1.8 the vast majority of the time. If I were to recommend just one lens that is cheap and could be used for narrative work it would be that. Jason would be the guy to ask for the Nikon lens info though.
As for SD cards, just make sure it's rated at class 10 and no lower than 16gb. If you hack the GH2 to higher bit rate it will take up more data per second, thus reducing your record time (another reason why don't like to hack mine).
