My existing house has 600sqft of 1/2" hePex (Wirsbo). I have an addition under construction with 600sqft of 1/2" radiant pex (Watts orange) in the basement slab and 600sqft of 3/8 Onix (Watts black "rubber hose") 2nd floor. I need to install tubing on the 1st floor (600sqft). Any suggestions? Apparently the Onix is much easier to work with but much more expensive also. This will be staple up install with 2/3 hardwood and 1/3 tile flooring.