I would personally like to add 50-60 hp nozzles myself.
I was thinking I would add the Arson III kit first. Then put the nozzles on and monitor rail pressure. If you can't maintain rail pressure then upgrade pumps (Wicked offers you credit if you already have the Arson III).
I think you will need a CP3 upgrade to support the nozzles. From what I read an Arson III is good up to 90 hp injectors or so.
This is what I've gathered from research I've done. I'm sure others can offer first hand experience.
I was also considering running the F1 diesel nozzles, but I heard he is 8 weeks out right now. At least to check out and rebuild injectors. I had Don's Mach 1.6s in my 01 and they worked flawlessly. Know he has a good product, but they are also at a premium price.
Now I'm leaning towards Wicked's Mafia nozzles. His are also EDM'd. Heard good things about his stuff.