Hishon is definitely gonna have to move to the wing on the Avs, Duchene and Stastny are locked in as the top 2 centers and he's a top 6 kind of guy, plus O'Rielly is not short on potential himself at the #3 slot.
I don't know much about Watson, but Hishon has impressed me. At first he seemed like a reach at 17th overall in the 2010 draft, but he was actually a very hyped/promising prospect who had a great season in 08/09, considered a top 10 talent for 2010 at the end of 2009, only to see his stock drop in 09/10 due to injuries. I still don't understand why he was cut from Canada's 2011 WJC squad, they went way overboard with size over skill. From the couple Owen Sound games I've seen over the past few years he's a high energy, highly skilled player, good hands and great vision, and very strong on the puck for his size. Definitely a guy with top 6 upside, assuming he can make the transition to the wing. I like avsman's Patrick Kane comparison, probably a poor man's version offensively, but possibly better defensively, Hishon seems to play a fairly 2 way game.