You will be right in the middle of some great fishing, including the Arkansas.
As far as equipment, I’d recommend a 5wt rod, breathable waders, good wading boots, and a good wading staff and net. You’ll be very thankful that you have a wading staff.
I doubt that the equipment needs will vary greatly from the rivers you currently fish. You’ll probably deal with more wind and wider rivers than you may be used to, but there is a lot of good water near there, so you will have a lot of different fishing conditions.
A Gore-Tex wading jacket would be handy as well.
Enjoy your time in Colorado.