[bboy9000]

I'm with Martin on the melanoidan malt instead of the Vienna, though a decoction is even better.
I'm with duboman on the more even balance between wheat and pilsner malt.  (I'd go 50 wheat/40 pils/10 mel).
I'm partial to the 3068 because that's what I've always used but a friend of mine did the WLP300 side by side split batch with 3068 and the 300 won hands down.

1 oz 4% noble hop at 60 but none at flame out.
62F.

Good luck!

I just started drinking my hefe with 60% wheat and 40% pilsner.  It's good but I'm going to rebrew the recipe with the 10% melanoidan as stated above.  I almost did it the first time and wish I did but it was my first attempt at a hefe so I wanted to see what the wheat and pils would do.

[brewinhard]

I like to run close to 60% wheat malt as well in my hefe's.  Simply to make sure that the wheat malt note is in the forefront. 

[HoosierBrew]

+1 to 60% wheat / 40% malt. I used to use 50/50, but I like this blend better. IIRC several of the German imports use it as well.