Time to move from Boxster - Opinions appreciated

[Ciao]

I've never owned a BMW, but am sure they are great vehicles. I currently own an Audi A4. I perform most all my own maintenance on the Audi: Oil/filter changes, fuel filter, air filter, spark plugs, brake pads, flushed brake fluid, replaced coils, etc. I purchased new in 2006 and has 144,000 miles with no issues. I did get factory to replace timing belt based on manual recommendations. I get 26 - 29 Mpg average. It has a turbo and no issues. I have never missed an oil change (100% synthetic) every 5K miles. It's great for the snow here in Colorado. I would consider getting another one, but this one is like new interior/exterior and runs like new.