Funny how a lot of suggestions have been referenced as overpayments. I see them all as lowball offers, personally.
For Giroux, I think you should start with what you would offer for Crosby, then dial it back two or three notches. That means at least one of Eberle or Hall must be in the offer... potentially both.
If you're realistic about grabbing Giroux, I would start with Eberle, one from the Duchene/Eriksson/Landeskog/Pacioretty group, and your 1st rounder in 2013 and 2014.
[sigh] I miss hockey.
15 GM Keeper League w/Roto Scoring (G, A, +/-, PIM, PPP, GWG | W, GAA, SV%, SHO)
Start 4 C, 4 LW, 4 RW, 6 D, 2 G (23-man rosters) | Protect 10 players w/a max of 1 goalie
C - Crosby*, Malkin* (C/R), Tavares*, Roy, Mueller
L - Marleau* (C/L), Duchene* (C/L), Doan (L/R), McLeod
R - Giroux* (C/R), Kane* (C/R), Grabner, Kassian, Boll
D - Yandle*, Letang*, McDonagh, Hamilton, Oduya, Clitsome
G - Lundqvist*, Halak, Fasth