The new X5 and Q7 are WAY too big for me. The X3 is great, but if it grows, then it's out too. Maybe the X1 down the road...
I recently drove a friend's X5 4.4 and was happy to get back into my X3. The X5 was simply too big, too heavy, and not as nimble, responsive, and fun as a BMW should be. Oh well, not for me.