If you liked the Root, try the China 5... ;-)
I am not a fan of the original ACID line, excepting the blondie, however, the natural line has impressed me so far...I have had the Root, the China 5, the Mixed Elements, and the Green Hero...
On a side note, for those of you that keep a stock of ACIDs around, at what humidity do you keep yours? I have found that the taste best at around 65% in the box, which is odd for me because my other 'dors are all kept between 70-80%...The ACIDs just didn't seem right that wet..