Doors and Air Canister for 2008 RZR

I have a stock 2008 RZR 800 and looking to get some smooth panel doors like the Trail Armor Slimline or RPM…I know that Pro Armor are probably the most widely sold but want some experienced opinions. Want to keep it to 50" since mine is not an S-type. I do like the look of the Holz Racing doors on their machines but not sure if it is an aftermarket product. I do think they now make a low door that looks nice.

Also, need to get rid of the stock air canister probably going to the Drangonfire and ride in Florida and Georgia with sand, clay and some mud…do not ride in deep water. Any suggestions or comments on what not to purchase, but heard K&N is a definite no.