I would strongly suggest buying a classical guitar. The neck is much wider, and fingerpicking is way easier with greater distance between the strings. As for rock leads, well it will develop your left hand technique, which can't hurt. Aside from that, the right hand stuff isn't too applicable to rock leads, but so what, rock leads aren't everything. If you ever get into jazz playing, having good fingerstyle technique will be invaluable if you want to play chord melody arrangements. Also, the classical stuff itself is very rewarding, because you can play it anywhere anytime, without a band. That's a problem I've found with rock, you really need a band for it to sound any good, otherwise you're just playing the guitar part to a song. With classical guitar you are the whole band, and it can be far more rewarding when playing alone.