Voracek, a six-foot-one Czech right-winger with the QMJHL's Halifax Mooseheads, grabbed top spot by amassing 34 points including 13 goals in his first 24 games.
"He's the kind of kid that if he takes a shot and misses the net he'll be the first one on the rebound to pick up the loose puck," says coach Cam Russell. "His feet are always moving.
"I see a lot of Peter Forsberg-like traits. He's solid on the puck, and he's not intimidated."
Van Riemsdyk, an American left-winger on the U.S. under-18 development team based in Ann Arbor, Mich., had 14 goals and nine assists in his first 16 games. The six-foot-three native of Middleton, N.J., was No. 8 in October ISS projections.
"His lofty ranking here at ISS may surprise some experts," the November ISS report states. "However, after watching his development over the past few years, we feel he has the poltential to be a star."
The October ISS report had forward Logan Couture of the OHL's Ottawa '67s as No. 1, Voracek as No. 2 and centre Angelo Esposito of the QMJH's Quebec Remparts as No. 3.
Couture has slipped to third, and Esposito now is listed sixth.
Trevor Cann of the OHL's Peterborough Petes has jumped to No. 1 from No. 4 among ranked goaltenders.
The projected No. 1 pick by ISS for the 2008 NHL entry draft is defenceman Drew Doughty of the OHL's Guelph Storm. Centre Steve Stamkos of the OHL's Sarnia Sting is No. 2 and centre Colin Wilson of the U.S. under-18 development team is No. 3.