Yep, I think when you start comparing Schoeps, DPAs, Neumanns, Milabs, Earthworks, etc, you probably are getting into which particular flavor you like -- all are very high quality.
You need to be careful with the Earthworks on what you pair them with, since they draw 10ma of phantom power each, which is the upper limit for the phantom power spec, and not all preamps/recorders are available to provide that much juice. Most other condensors draw around 2-5ma of power, so it isn't generally an issue providing the necessary power to them.
As to omni vs cardioid, the cardioid mics are probably a better all-round general purpose mic. Depending on how you conduct interviews though, maybe you'd prefer omnis.
As to the other stuff, you'll probably need: mic cables (or shorter XLR interconnect cables if using mic body + active cable/capsule arrangements), rechargeable batteries (either internal or external) + charger, a microphone stand(s), some kind of bag to house everything (Lowepro AW nova series is popular and pretty cheap, or the professional Portabrace or Petrol bags), a stereo T-bar to hold two mics. Lots of options on all this stuff if you search around on ts.com.
On the mic stand issue, many tapers here use large lighting stands with the appropriate adapters to get a 9-13' mic stand. If you are doing interviews across a table for instance, you might want little 3"-6" table top mic stands. It all really depends on your application.