Profoto announced their new D2 mono head today, and its something you should look into. When I was at Profoto’s HQ in Sweden back in May they showed a group of us a pre-production D2. Lot’s of information on the Profoto site on its specs.
Key features I notice:
• Fast refresh – 20 pops per sec at max.
• Fast flash duration (1/63,000 of a sec.)
• New menu system on the back of the head.
• 1/8000 sync on Canon / Nikon.