Yeah, if you wanna keep your 0.66 box, you don't want the ones I showed in my original post. They are at (what I consider) a great price, but if they won't work for you then theat's not a good price at all.
ayjay reco'd some good subs for your fit, and you could also look at Kicker, some of their subs work well in small boxes. You can check them out on this "U.S." site

. Looks like you can get them straight from Elemental Designs for a decent price.
(see what happens when I don't ask questions, I give bad info

, j/k)