Hey all. Thanks for the responses, and sorry for abandoning the thread. I didn't expect more than a couple responses, so once I got those, I stopped looking for new replies. Oops! That said, all of your responses are much appreciated.
Several of you asked why I was leaning toward a 7-cell. While I'm not set on anything, I was leaning that direction for two reasons. First, I like the idea of a very docile canopy. I'm a nervous wreck under canopy, so I want my first main to be pretty forgiving. Second, smaller pack volume. I don't know for sure how quickly I'll be able to downsize, of course, but starting with a 7-cell canopy (or a small-packing 9-cell like a Pulse or zpx Pilot) would allow me to downsize a couple times with the same container.
Again, I haven't made any firm decisions, but I also don't care too much about the various flight characteristics of my first main as long as it opens and gets me to the ground safely. I just see it as something to use while I'm building my skills and deciding what's really important to me in a canopy. Then, when it's time to downsize, I'll know more about what I want. Am I going about this the wrong way?