Small Forward is actually pretty loaded in the late lottery..
DraftExpress has about 4 players that will play SF in the NBA from #7 - #14.
Alex Poythress is my number 1 SF prospect. He's 6'8, 210lbs, with a 7'0 wingspan and is very aggressive and athletic. He's going to be heading to UK after being ranked the #13 prospect in the country. Reminds me of MKG/Moe Harkless a little.. might be a bit bigger but not quiet as fluid as Harkless but skillset wise this seems to be a good comparison from.
http://www.youtube.com/watch?v=FOy6KzL-t0w
Also, Tony Mitchell from North Texas will be very interesting to see. As a freshman, he averaged 14.7 points, 10.3 rebounds, and 3.0 blocks per game. He shot 56.7% from the field, 43.9% from 3, and 73.9% from the FT line with a PER of 29.6. He's 6'7, 215lbs, with a 7'2 wingspan. There's not much footage on him but I was able to find this impressive video from him.
http://www.youtube.com/watch?v=kS9no-OW5UE
As for centers, there's nobody I really love besides Cody Zeller or Rudy Gobert who we won't have a shot at.. don't see any of these guys being any better than Robin Lopez honestly and wouldn't be worth the pick. SF should definitely be our target this year; there's some good ones.