I have tried making a couple of ...
Imperial IPAs but have better luck with the ones with 6-7% ABV.
There are some really good Imperial or Double IPAs out there but if you don't like hoppy, strong beer in the 8-10% ABV with some elevated IBUs, then these are NOT for you.
I would recommend ...
Lagunitas Hop Stoopid (Calif) - 8% ABV, ~ 100 IBU
Hercules Double IPA (Denver) - 10% ABV, ~ 85 IBU
Ruination IPA (Calif - best beer Stone makes 'cause I like good 'hoppy' beer) - 8% ABV, ~95 IBU
Double Trouble (Mich - again, best beer Founder's makes; or, at least tied with Founder's Oatmeal Breakfast Stout) - 10% ABV, ~85 IBU
90 Minute Imperial IPA (Del - to me, this beer is really inconsistant; one good, next not so good) - 9% ABV, ~90 IBU
ABV = Alcohol by Volume
IBU = International Bittering Units - measure of bitterness