I thought that up earlier without too much though. I tried to improve on it.
Stewart
Miller
Sens 2014 2nd
Halak
Greening
Puempel
Blues 2014 1st
Sens: Puempel, Greening, 2014 2nd for Stewart
Blues: Halak, Stewart, 2014 1st For Miller & 2nd
Sabres: Miller for Halak, Greening, Puempel, 1st
Sens get a winger for Spezza while giving up expandable pieces.
Blues get the goalie they need for the playoffs without giving up any crucial pieces. Halak is upgraded and Stewart is replaced with Jaskin.
Sabres get the 1st they want, Murray likes Puempel, and a decent goalie to try out... they cant just roll with Enroth. Oh and Greening.