because I'm practical and wnat to get the most bang for my buck, I have to vote for the FIRST. Also, the first is my absolute favorite style. I adore the look. Like you said, the First will be most functional because you can use it on a regular day as well, if you're not carrying much. I think the black will work fine for clubbing- certainly not as flashy, but it's small and black and should work beautifully. I also agree that the shoulder would be a great option, but it doesn't come in GH. But it'd be very easy to dance with!
Between the clutches, I'd vote for the envelope. I really don't like the flat clutch- it's so large and looks strange hanging on that one strap. I dunno what it is, it just doesn't appeal to me. It's too flat and square.