Is The Grass Greener?

I have a very nice 1999 SL500 with 34K miles with both hard tops in Desert Silver. I recently found a 2002 Silver Arrow with 58K miles and panoramic roof for $15K. Do you think there is enough collectability worth in the Silver Arrow branding to justify trading? I could just keep both, but only have a 2 car garage. Was the build quality compromised between 1999 & 2002, with the merger having time to sink in?

Thanks!

Ben