Well, it depends what you mean by "power levelling". If you've got multiple people helping (you mention "family"), and with the early AA XP boost (500% faster AA's to start), frankly, I'd just get all AA's as they are available. It will go so fast it will be just silly, so just get them done.
I haven't played in almost a year now, but I was PL'ing some alts on a 2nd account, and found that I could get dozens of AA/hour with just one higher level toon helping out. I did skip the truly worthless AA's (stat increase AA's... NOT the stat CAP increase AA's, those are useful), But you'll rack up AA's so quick, honestly, just get everything you think you'll want, as soon as they are offered. Another advantage with this approach, is you can get the AA's in lower level zones, where the helpers will be more over-powered, and the XP will go that much quicker. Remember to get the XP from red/yellow mobs that are within 5 levels of you, and use your daily lesson!
Obviously, for non-power-levelling situations, this would not necessarily apply.
PS - Nadox was my favorite PL spot. Use a DS class to pull, and just use an AoE spell to tag the mobs with the cleric.
Tatankaa (95 Inquis)/Urkell (38 Conj)/ Seanthornton (24 Pally), <Inisfree> Freeport server
Tatanka Wolfdancer, 93 Wood Elf Druid, 7 x 300 Master Artisan
Anaceup Mysleeves, 93 Erudite Mage
Snookims Whinslow, 93 Erudite Enchanter
<Inisfree>, Tunare (Seventh Hammer!)