Personally, the choice is yours.
I have a '94 3 Series, and I looked at replacing it once with a newer 5
Series on the notion that the 5 would be larger. I was surprised to find
that it really wasn't that much bigger, it wasn't enough bigger to justify
changing one perfeclty good car for another, but it was enough larger to buy
it if I was out to buy a new car and didn't care about the price
differential. That is, if I had any car from Brand X and was convinced that
it was time to replace it, then the 5 would be a better choice for me than
the 3, but since I got a great deal on my 3, I wouldn't trade it for a 5
just because I wanted more room.
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