Buying a luxury car, brand new, is the WORST.....why be the one to take the hit? Unless you lease it, it's not a good idea to throw down 50K after taxes/fees/financing, drive it for 5 years then sell it for around 22-25K, which means you ended up spending around $420 a month, which you could initially have worked out a lease deal in the beginning for around $2000 down $399 a month for 2-3 years, enjoy the new car for less time and not worry about selling it later.
I'd wait another 2 years for the lease returns and pay around $25-28 for the new style FX.....