I thought you were speaking about BTC, not alts - I'd say that this is not a bad moment to dump LTC and NMC (don't even know about the others, the only one which is semi-interesting to me is PPC).
Haha, just edited my post. This is getting complex. I'll hold on at least until tomorrow and decide then. Not to many strong believers in altcoins here. Personally I haven't really made up my mind.