I usually allow 1.5 hours for driving (I live near Monument too) and 1.5 hours from my car in the parking lot to the terminal. I don't check bags either so I end up sitting in the terminal and waiting - but I'd rather be 45 minutes early than one minute late. So for a plane that leaves at 11AM I'd leave home at 8AM. You could also take highway 83, it is more scenic and you might avoid a little slowing near the 25/470 intersection although 83 slows down in Parker.
I park in the economy lot for I think $8 or $9. There is Pikes Peak parking offsite for around $5 or $6 but you have to monkey around with the shuttle bus. One thing we'd do for a long vacation like two weeks is rent an el cheapo car from our local neighborhood one way to the airport and one way back. It may be cheaper than taking your own car and paying for parking.
Monday morning security at DEN airport is like 30 minutes. Wednesday morning it is about three minutes so factor that in. Also, the economy lots can fill up. There is a phone for lots of good real time information below:
http://www.flydenver.com/guide/tips/index.asp
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COS to DIA next week
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