I did see that, but I like the idea of a $250 DD and $100 kit upgrade.
I wouldn't use the iPad for anything other than what the new app radios can do.
So far, thinking Kenwood DDX372BT
I paid around $200 for a used mini with the GPS which works great with the stock HU. I have since upgraded the HU to a single DIN Pioneer to get a decent hands free set up. All in was just a bit over $300.
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2001 Boxster S Lapis Blue
TS Cat Bypass Pipes and exhaust
iPad Mini Dash Install
DEPO Tail Lights