I plan to eventually add a "weekend" car as well - focused on a cabrio. Top of the list has been a 911, but the reviews of the 2013 Boxster S sound interesting. Have also considered the M3 convertable. never been a big fan of the SLs.
Current: 2016 Silverstone M5, 2014 Anvil WW Jeep Wrangler
Previous: 2013 Monte Carlo Blue M5 (ED on 9/1/12), 2009 Carbon Black M5, 2006 Silverstone M5, 2003 Sterling Grey M5, 2000 Anthracite 540i6, 1998 Jeep Grand Cherokee 5.9Ltd, 1990 Eagle Talon TSi AWD, 1978 Mazda RX-7