Need help with my current setup

Hey guys, so I need some help deciding what to do with my current setup. In my sig you can see that I have the iMac 27" and a Macbook and an iPad. I feel like I haven't been using my iMac that much lately. I much prefer to just sit on my bed rather than go to my desk these days. I stay at home and do some classes online so that is pretty much all I use my computers for.

I am starting to feel bad because it is such a beautiful machine with amazing capabilities and I am not using it to its full potential. I received it as sort of a gift for the first time I beat cancer.... So it has some sentimental value to me.

Soo... I was thinking, do you guys think it would be a wise idea to perhaps sell my Macbook and my iMac and buy a refurbished Macbook Air 11" and the 27" Cinema Display? I know someone who will buy both my iMac and Macbook for $2,100... Both have apple care and are a little bit over a year old. The Air and ACD would cost me $1,800... I don't know if it is worth it though in terms of power.

Let me know what you think! Any thoughts or opinions are appreciated