Your hair sounds like mine! If it's very fine, a good basic conditioner to use is Suave Naturals Coconut (which has a lot of protein - fine hair tends to need protein). I'd use that for your co-wash and use the VO5 for your rinse-out instead, but it's up to you. The best part is, Suave is available at any drugstore and super cheap.
Also, the Herbal Essences gels are all great. The lightest one is probably Totally Twisted - and if you find that gel is still too heavy, try diluting it with a little water. My hair can't take heavy gel either but the HE gels work fine, and they're under $5! Yay! I've also heard lots of praise for La Bella Lots of Curls, Biosilk Rock Hard Gelee and LA Looks Sport Gel, but none of those are available in drugstores where I live so I haven't tried them.
I don't think your Paul Mitchell mousse is too bad, but if you're going modified-CG for right now and can't switch yet, you can keep using it. From what I can see it has a couple of PEG-modified cones and polyquats - the danger is that it may dry out your hair.
CG is all about experimenting, though. You may have to adjust how long you plop for, how much gel you put in, etc. etc. Good luck and you can ask questions here anytime - everyone is very helpful. I still have questions myself.
Btw - I love your screenname.