I like the Juice 16 over the 17... the spin is as good for me, control is noticeably better... my topspin forehand down the line from the ad is killer with the 16... I can topspin it heavy and drop right over the net, blast it past with good pace, or heavy topspin about 6-7 foot over the net and drop it in the back corner of the alley.
I'll have to look up the Pacific white stuff you mention. I've hit with Pacific before... the Poly Force Original, Extremee and the X(?)... liked them all. I'd say the Original is somewhere in the bottom half of my top ten... but I didn't like it as much when I switched to a Dunlop racquet.... I think strings can work so much different in different racquets...