Congrats on the purchase, and yes, if the guitar is in very good shape, that's a great price.
Seven strings got a bad rap with the whole 'Korn thing'. People immediatly assumed that if you played one, that either a) that's what you played or b) that's all you could play. Total ****
if you ask me.
I'm essentially a seven string player only now. I still own six strings and may even purchase some in the future, but I almost feel limited now on one. The transition to seven isn't hard, it's harder to go back and forth between the two constantly. Even then, it only takes a few days.
As far as the pickups, I hated the stockers. I found them thin and gutless with very little personality. I put in 2 Dimarzios, a Tone Zone 7 and a PAF7 and am extremely happy. As a side note, the Duncan JB7 is very very nice too.
In a nutshell, you can do anything you do on 6 on a 7, but you can't do most of what you do on a 7 on a 6. It's all a personal thing. I'd always rather have the extra string and use when I need it then not have the option.
Hope the UV turns out good for you.