It was between a C63 AMG, Jag XF-R and my IS-F when i bought it.
Jag looked a bit plain next to the others, and headbolt horror stories put me off the C63.
Think it only affects certain engines of models up to 2010, and you can see if any potential purchases have one of the suspect engines via the engine number. They can be replaced by studs that sort the problem.
There is the CLS 63 AMG also which has 4 seats like the ISF, or a Porsche Cayman S if you can live with 2 seats.
Personally tho the mid to late 2000's shape XKR's look stunning. Or maybe a BMW M6?