Out of the listed options, with money being a factor, I would get a pass to Loveland, but that's just me...I'm sure everyone else is going to say Vail Resorts.
Personally I think Monarch's Pass is one of the best deals in the state (though a little far from Ft. Collins). For $329 you get unlimited skiing at Monarch, 1/2 price tickets to Alta all season, 1 free unguided day at Silverton, 3 free days at Durango Mtn, 3 days at Powderhorn, 3 days at Sunlight, 3 days at Loveland. As well as 3 free days at Angel Fire, Pajarito, and Sipapu in New Mexico - and free skiing at Grand Targhee, Wyoming when staying at an on-mountain lodger.
Great deal if you like to travel around a little...