Oh hay there fellow Mareep family enthusiastMy Ampharos is quiet, but meh, I was too lazy to go looking for a modest one, and anyway it was a trade present :x
The only difference in my Amphy moveset is Focus Blast over Light Screen, but in my experience, that move has an AWFUL record of missing when you don't want it to miss (70 accuracy... and you can't even boost it with weather like Thunder) so yes don't be silly like me and think you can pwn Rock pogeys just because you have a fighting special-based move... (I realize I'm not being very helpful here... I'm sorry :x)
Item: I'm having a Quick Claw on Amphy right now; it's saved me (or rather, I lucked out) many a time when slow-as-molasses Amphy would've died just cos it's slow as hell, but I think there could be better items on it. I'm not sure.