If the team is set on buying, I'm on the Marcel Goc bandwagon. Cheap in both salary and likely assets to acquire him, allows you to either move MP in a trade, or move him to the wing if Chimera's traded, and is decent in the faceoff dot.
I was thinking a 3rd, maybe a 2nd....certainly not a the 1st. I'd throw in a middling prospect too if needed.
Somewhat comparable players in Clowe and Morrow each returned a 2nd + (the + for each was significant), and they're pending UFAs. I'd think the extra term on Ott's deal would push his price to a 1st+. No way I'd pay that for him.