While I think you could use more goaltending help, I dont know if I would be buying into Lou in a cap style of league. Then again, i guess it depends on the rules of your league.
Lou has 10 years left on his contract and will probably be a top goalie for another 3-4 years at best (he's 33 years old). If your league lets you drop guys under contract with no buy-out penalty then this looks like a good deal. If you have to pay a penalty for buying a contract out before it expires, I wouldnt touch Lou. If he only has 3-4 years of good production left, what are you going to do with him for those other 6 or so years of declining production at 5.33M per year?
I guess it depends on your league settings. I dont have that info so its hard to give you any more info on your deal.
10 Team, Points Only, Cash League
25 Man Roster (no position), top 20 point getters count at end of month
Keep 20/25 at seasons end, Cut 5 to FA for redrafting
Goalie points W=2pt L=-1pt SHO=2pt
Stamkos, Tavares, Hall, Couture, Wheeler, Filpulla, Eriksson, Hodgson, Turris, Steen, Letang, DRoy, Yakupov, Byfuglien, Baertschi, Zuccarello, Silfverberg, Boedker, JSchwartz, Killorn, Bonino, BNelson
G-Rask, Halak, Schneider