would keep the E6600 and get 2 x 2Gb of 800mhz RAM myself
oooohhh and treat your sis with 2 x 2Gb of 667 as well
ive already got 2x1 gb so to save alittle i would just get another 2x1gb
and not spending anymore on my sister shes a grown woman and can get her own ha ha
