with mine I just threw in 2 oz simcoe, 2 oz amarillo, 2 oz warrior, and some leftover citra I had in the keg and let it carb real slow over 2 weeks.
To be honest I felt like it was WAY too much, it was like hop dust and rubbing alcohol for a long time. I definitely would do a more gradual dry hop (and about half what I used). My dogfish 120 is about a month old, but I will be waiting atleast 3 more before I crack my next bottle. It was WAY to fiery and fruity-hoppy for me (maybe it was the citra) Either way, I look at it like bitter-half-bourbon and I plan to let it age similarly =P