Should I Buy another Boxster

[Soetekouw]

I know this will be a personal decision, but...................should I buy a new 2011 Boxster S and trade-in my 2007 Boxster S? Options between the two are comparable. Main reason for trade is that one will have an expired warranty, the other will have a 4-year warranty.

I currently have a 2007 Boxster S. paid-off.
44,000 miles (warranty about to expire) - main reason for considering selling
PASM
Sports Chrono
Automatic - Tiptronic
Bose
CD-Changer
Power seats
Sports wheel
and some other minor options.

I paid $66K. Free title. Trade-in should be about $30K.
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A 2011 Boxster S (w/taxes) will run approx. $72K. Less the $30K expected trade-in will result as a $40K out-of-pocket.
PASM
Sports Chrono
Automatic - DoppelKupplung
Leather Pkg
Power seats
Sports wheel
and some other minor options.

Am I gaining anything by trading to the new model (w/new warranty), or should I just keep my current vehicle and hope there are no major repair requirements that will come up? What is the Boxster's reliability after 50K miles?

Thanks

Rob