First, you're asking if you should buy a BMW or a Porsche on a Porsche forum. Expect most everyone to tell you not to buy the bimmer and the boxster is better.
You forgot to add a bunch of CONS for both the Boxster and the BMW.
BMW Cons: Oil Leaks oPlenty and suspension parts (control arms and struts) go out at 70k miles or so. Coil packs go out around this time too. It's atrocious how crappy the parts are on 2005-2010 BMWs. (I owned a 2007 550i so I know what I'm talking about).
Porsche Cons: Do a search on this forum. There are plenty so I won't waste space telling you about them.
My ex-bimmer mechanic told me to budget $2000 a year for BMW ownership if the car is out of warranty. He said you may drop $6k in it for two years then nothing for four or five more, but it equals out to $2k a year on average.
My boxster has not cost me nearly as much on average per year, although it was a first year car and early production to boot and has had a whopping number of things go out on it due to poor build quality.
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