i would definitely recommend kervansaray hotels. they have three hotels near the slopes: the kervansaray bursa, termal and uludag. We stayed in the kervansaray termal and I must say we really enjoyed it. It's got an indoor heated pool from its thermal spring, the food was nice, and it is relatively close to the slopes...check out their website: kervansarayhotels.com
We went their december, from Istanbul on our way to Ephesus and Antalya. The hotel was recommended (just as a stopover hotel) by citywindows, a travel agency in Istanbul who helped us organise our travel. We stayed for two nights and we loved it! I am not quite sure though if you will get a cheaper price if you book directly with the hotels or a travel agency...we definitely had a very good price when we went.
Hope this helps!
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