Bolland and Schremp are an interesting topic of discussion.
Schremp is the more natural talent, with as high end puck skills and playmaking ability as anyone in the draft. He is truly a wizard with the puck at his best. However, he has some question marks on his resume due to his leaving Mississauga and forcing a trade amid some rumours of him having a bit of an attitude. The more recent and pressing knock against him however, was he was basically benched when push came to shove in the London-Guelph series. While his team mates have never spoken ill of him (which is good), his coach was clearly mum on why he benched Schremp (which isn't good). Some feel his "supposed" attitude combined with his preference to play on the perimeter will be his undoing on his way to the NHL. He also did not really improve from his OHL rookie year in terms of production. At worst, he could be a Daniel Cleary or Daniel Tkachuk - a very skilled junior player who has trouble translating that talent to the NHL. Because if he is not a NHL scorer, he will not play in the NHL. However, he has unquestionable NHL skills and could be an NHL first liner one day who scores 70-80 points. It seems some scouts are just a little scared off by some those question marks in his past. But no one denies his talent. A good NHL comparison based on potential could be a Ray Whitney or even Pavol Demitra (if you can get the nationality out of your head).
Bolland on the other hand, has no such questions surrounding him. The only thing is his upside seems lower than Schremp's, and he is rather undersized. While CSB has ranked Bolland a tad higher, I would expect at least 20 of the 30 NHL teams have Schremp rated higher - but that is just a personal guess. Most scouting lists I've seen have Schremp ranked significantly higher. Bolland does seem to be the more natural goal scoring ability however, and he also plays a more rounded game and has shown tremendous natural hockey instincts and willingness to compete. He could be a scoring line forward in the Justin Williams mold, or he may end up being a checking line roll player. Either way, he's a relatively safe pick to play in the show some day. As one scout said "He's a hockey player.". Comparisons could be Alyn MacAuley or Curtis Brown maybe. Even Darcy Tucker less some of the side show Bob agitation factor.
Neither are exceptional skaters, but both are very quick, have good balance and solid from what I've seen. Schremp has the a more naturally solid frame, but uses it less from what I've seen.
So there you have it. I've seen both play, but most of what I know I've read, so much of this is second hand information. I love Bolland, but I'd have trouble taking him ahead of Schremp. But at the same time, I would feel much better in terms of a value pick by getting Bolland at #22, than getting Schremp at #6. Schremp scares scouts because he "could" bust, which is never something a scout wants out of a top 10 pick, but he scares them even more because if you pass on him, he could make you look like the fool.
Perry is an exceptionally talented forward prospect, but lacks typical NHL skating skills. He's big, but not overly physical. He has Jason Allison potential if he could improve his skating and use his body more. Otherwise, he may just be a depth scoring forward. He's the kind of guy a team will have to patient with, but still may be a gem in the end once he learns to adapt his skills to the pros, which may take some time given his skating will close some of the doors open to him at junior level.
EDITED: Added a few comparisons, the stuff on Perry and some grammar.