If it's not too late, I've got a set of D1 500 Airs in my studio that you can come check out.
Quick answer to a few questions:
You can use any softbox on them so long as you sue a Profoto compatible ring. If it were me, I'd buy Creative Light modifiers; distributed by the same people who distribute Profoto. The CL stuff is very well made and less than half the cost of Profoto. I also have a lot of Profoto and CL boxes in my studio so you can compare.
You can connect Pocket Wizards to the Airs -- but the Air system is so good, I would not.
I've written an article about the D1's here:
Busman’s Holiday: Shooting with Hanson Fong and My New Profoto D1 Airs - PrairieFire Productions
I know this is a big investment and if you'd like to stop by, contact me.
Steve