Haven't people did the calculations and you're much better going +15 with buffs or even going up the Chaos path now? I'm pretty sure I read the Magic/Lightning paths do less damage because they have 2 defenses to go through or something. I'm genuinely curious here as I've only went up the +15 and Chaos paths.
I really don't think it matters anyway outside of PvP. Use whatever the hell you want.
@LC if you're ever stuck on where to go at the beginning of the game I'd recommend talking to the crestfallen guy in firelink. From the minute you arrive there if you exhaust his conversation you can find out where to go to ring both bells. This goes with most NPCs too.