Here are the tiers http://www.smogon.com/dp/tiers/
As for Pokesav I'm not too sure, but from what I've seen before alot of people generally dislike Pokesav pokemon, but if they are fair I.E Normal IV's then I guess it's fine =S?
I haven't been able to find a B & W Tier list though... The one above show Tiers from Generation I - IV
Hope I helped a bit :)