Warbonnet is high quality stuff, but a little more costly. You probably won't need a bug screen with a hammock in CO depending on where you are.
Just a rough outline on what you'll need:
Tarp - WB Thunderfly 13.4oz $135
Hammock - ~16 oz depending on suspension and screen - $125
Suspension - Lots of options, tree straps and some carabiners - ~6 oz $30
Top Quilt - Hammockgear econ line 10f 25oz $192
Bottom Quilt - Hammockgear econ line 20f 23.7oz $150
Total system: $650+/- with shipping and 5.25 lbs
Edited to add: I used a 20f HG quilt and DIY hammock/tarp in SW CO a few years ago. It got down into the 20s at night, but with no wind or storms and I was OK, but not terribly warm - I'd wake up a few times in the night. That was with an insulated pad. I switched to an underquilt, and it seems to be a lot warmer and less prone to cold spots.