Thanks a lot everyone for all the tips, and for the pics! Think I'm gonna go ahead for the P2, and maybe get a mini as well. I'd like the larger, but the smaller ones do look a little better on the pen-likes. Not the most important point, but I'm curious about the vaping difference between the two as well.
Being new I try to keep it in the green looking at voltage charts. And I read that PT2 is ~2.5Ohm, so I'll probably keep it a little under 7w at first. But I'm interested in rebuilding one, too. Some of these other ones look pretty nice as well, and I might try more of them as time goes on. On a limited budget, so that's the main reason for concern and weighing options.