Yeah, I forgot about the dryer. Valve and dryer are fairly cheep though, under $20 each at Rockauto.
As for the hoses, you'll find no problem locating the hoses for the 4.0, they don't exist for the 2.5, however, I see little difference in them. They are expensive, IIRC.
I contacted Jeep Air in FL at the time and they told me to use my existing hoses, that the 'barrier hoses' were a nonsense ploy to sell new hoses.