Replying to Looking to get into A.T.

So I'm taking an avalanche course at my local college I believe around March 23rd or so, and I have been itching to go get some skis at a local used sports shop. However, I've done a bit of research and I know about the safety aspects of A.T. skiing, but not really sure about the skis I need. I have two skis currently, one as an everyday/mixed powder ski, and some Nordica Patrons for the extra deep days, which as of now if you live in Colorado, we haven't gotten much of those. I'm looking to add a 3rd ski to my "collection", particularly a more backcountry/AT ski. They have some Armada Norwalks, Rossi S7's, Sir Francis Bacons, Genomes, Black Diamond Megawatt, and some other pairs. The only pair set up for AT with AT bindings are the S7's, I'll attach a photo of them. I'm looking for more of a "budget" set up, just to get some experience with AT skiing. Any suggestions?