Hi! Welcome to AA friend! :P
Ok, you can go with 150lbs of LR
, but IMO
you are better off with getting all 200lbs or more at once. If money will allow get 250lbs of LR
for that size tank. This will also benefit you more biologically.
You will not need a wet/dry filter, but it would be good to set up a sump. This will allow you a place to keep your equipment, it will allow more water volume, it will help with flow on the return, and will skim the top of the water off as it falls into the overflow.
A chiller will probably not be necessary. You will have to wait and see on that, but being in Colorado you should have no problems at all.
The skimmer doesnt necessarily have to be tall, but it does need to be rated to be able to handle the type of water volume you will have.