Ha said he only wanna lay out a couple of thousands plus the trade in. Therefore, new 6, new 5 is not really a choice. Maybe possible to get the 11' 528i but as he said he want speed too.
I say go for S5 vert if you want a convertible. If not 3 series would do. You can always make it faster if you think it's not as fast as the 6.
2009 BMW 650i Cabrio (daily drive)
2011 Audi A4 (groceries, bully, road trip, winter beater, family car)
BMW CCA ID: 473647