I haven't had experience with Seaguars INVIZX yet, as i normally use BPS's XPS FC and PLine's flourocarbon.
If you haven't stumbled across it on google already, the staff at tackletour did a pretty extensive test on some of the popular flourocarbon lines out there....heres the link...
http://www.tackletour.com/reviewfluorocarbon2.html
take your time and read through the whole review, it's quite interesting!
edit: oh yes, i forgot to add that for flourocarbon with minimal memory, i've had good experiences with the Berkley Vanish. They don't have quite as high of a rating in areas that you would expect from a flourocarbon line (abrasion resistance and stretch) but for the money and its low memory qualities, its worth a trial.
andrew