I'd actually make that deal, in a one-year league. Marchand is having a fine year, will help you in the categories you need, and Boston has only played 22 games in the NHL so far (the fewest games in the entire league). The best is yet to come for their players, and Marchand will be right in the middle of it all.
Benn just seems to be having a bit of an off year, not to mention the injury which, although doesn't sound too serious, may hamper him a bit. Plus, the 1st round pick is awesome.
12 team, H2H, salary cap
1 pt/G or A, 2 pts/W, 1 pt/OTL, 1 pt/SO
Forward: B. Point, M. Necas, A. Debrincat, T. Zegras, J. Bratt, L. Raymond
Defense: J. Morrissey, A. DeAngelo, S. Gostisbehere, D. Doughty
Goalie: T. Demko, E. Merzlikins
Bench: M. Rossi, C. Glass, M. Maccelli, M. Dumba, K. Shattenkirk, F. Andersen
Prospects of Note: L. Stankoven, J. Lekkerimaki, D. Yurov, B. Clarke
League has been running continuously since 1997-98