i have 2011 ultimate, never really have any problem with the fan running extremely loud. and i have parallel desk top running my boot camp all the time. RAM's work load is staying at 95% or above all the time...
Fan normally only runs around 2000rpm....
Battery does drain out fast on my normal use... but if i want to conserve the battery, it does last me up to 7 hrs or so...
it really depends on how you use it and how much you willing to spend....
2010 ultimate model is not bad, especially for the price of $1100 shipped... it would feel faster than your 2010mbp, since the ssd would give that extra boost!! And i don't think you gonna feel much different from a slower CPU, 2.13GHz VS 2.4GHz