AFAICT the main difference aside from cargo capacity is gas mileage ratings - the V70 is rated for 20mpg city versus 22mpg for the V50. I'm leaning toward the V50 for a variety of reasons but some members of the household think that SIZE MATTERS *g* Comments appreciated, esp regarding long-term mechanical issues either model might experience more frequently than the other. Because really, long-term reliability and low cost of ownership is going to be the deciding factor for us. Whichever we end up with will be certified used from the dealer, with some portion of warranty remaining.