If you're looking at a new car, the E60 has been discontinued. The new 2011 5'er is the F10 and there should be a new 3 series coming as a 2012 model sometime
But, since I think age is a matter of the mind more than the calendar ... the 5 is a larger car and more expensive car. I believe there are more mod options for the E90 just because there are a larger # of them on the road, and thus a larger potential market. And while a 550xi will leave my poor 325xi in the dust, I would say that the 3 is generally more sporty and the 5 more luxury.
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2011 528i Space Gray - Black - Light Wood Trim
2006 325xi |SG - Terra - Walnut | Steptronic | Premium Package - Nav | Zenon Adaptive Headlights | Blacklines; iPod Adapter
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