Clutch. I have a feeling the session would be a total blast.
If I'm allowed a fictional wish, I'd kill to work with a super-talented, original musician - who is also a super-cool person and a pleasure to work with - on a vocals/instrument -type of album like the John Mayer and Nerina Pallot stuff, with a budget big enough to get super-cool percussions and super-cool orchestral instruments in there (if needed). Also, the space would sound absolutely fucking awesome, we would only do eight-hour days unless I really feel like working longer (with 45-minute lunch breaks, naturally), I would have super-nice gear at my disposal, I would be at a skill level that would do justice to the unbelievable potential the performers and the environment had and there would be fresh coffee in my mug at all times, with just a drop of cream and two spoons of sugar. Shit, did I get carried away?