Different editors have different favorite systems for how they personally work. As far as processor speed, buy the most you can buy. I don't care what you're buying Mac, Windows or NT, buy all the processor speed and RAM you can afford. You've probably heard this before and it's frustrated you because it isn't a number. That can't really be helped.
Most new computers can do the job.
A 'minimum' processor and RAM specification will be recommended for every system. The more speed and RAM you add above the minimum, the more speed and processing power you get. As far as storage, calculate how much footage you want to work with multiplied by its data rate on the system you decide you like to work with. The DV codec is very efficient choice and more systems are available that work with it all the time. As you consider DV editors, look carefully at the way the video data is handled once it's inside the system.