Just purchased my first BMW! 328i coupe..Questions

Hello everyone, I'm new to this board and new to the BMW world.

The car I purchased:

2007 BMW 328i Coupe
Space Gray w/ Black Interior (darker wood trim...don't know exactly what it's called)
Premium Package + Sports Package (comes with 18' wheels with new tires)
30,098 miles on odometer
Clean/Clear title
Last owner purchased as a CPO (so I get remainder of his warranty and free maintenance which expires June 2013)

$21,000.00

My questions are as follows:

1.) Was this a great deal, ok deal, or not so good deal?
2.) How easy is it to convert my wood trim to the brush aluminum? Where can i find the trim?
3.) I declined the dealers extended warranty because they wanted to charge me $5,000 for a 5 yr/100,000 coverage from CNA National. Should I get CarChex? is that the best most trustworthy 3rd party extended warranty?
4.) How much would it be to get the aerokit lip for this vehicle? I can't find it anywhere. Where can I purchase it for cheaper?


I can't wait to pick it up this Wednesday!