The NSPs are generally good beginners boards for two main reasons - the epoxy they use is tough and doesnt ding very easily, and its quite buoyant (more buoyant that 'normal' PU).
The downsides are that it can be 'chattery' - sits on the wave rather than in the wave. This is probably not something that will worry you as a beginner. (oh, and having an NSP will probably mark you out as a beginner when you walk down from your car to the beach; which concerns some people. I always figure that becomes very obvious as soon as I am in the water, so why worry about it)
From reading/talking to people with NSPs, they appear to be harder to manoeuvre than other boards because of their shape, but this is only an issue for you in about 2 years time when you have learnt all the other things you need to learn... So its not a board you will likely keep for the rest of your surfing life, but its a board that will get you through the first few years
(actually, this thread shows all sides to the nsp debate:
viewtopic.php?f=20&t=13922). Note that the beginners say they like the board, the experienced surfers say they dont.
Looks like a good choice. 7ft10 is probably toward the bottom of the length range for a beginner, but if you buy it and it turns out to be too hard, you should be able to sell it for much the same price because its unlikely you will damage it. (that said, I have no idea whether the price being asked is 'market price' or not).
The fin set up looks a bit strange - maybe jaffa or something who knows fins better can comment - usually you have a long centre fin and shorter side fins; this one seems to have three long fins. But that is easily fixed.