If you are going to spend the money anywhere, spend it on whatever it takes to make your wife comfortable. Mine has a Western Mountaineering Aspen, but she could have had anything she wanted. In the long run, having her go with you is cheaper than leaving her at home. The Aspen costs a multiple of $60, but it will open flat, and will sleep two with its summer "coupler", and it will double as a quilt in the hammock on your solo trip.
Good luck at your $60 price point. I have my doubts about Slumberjack vs your existing bag.