I can see you’re not a beginner, but there is some good advice in this topic on this site: http://www.violintutorpro.com/how-to-find-the-perfect-beginner-violin/
Any advice on violins applies equally to violas. Of course, you should take a look at Superior Violins for offers and purchase/rent options. I know that when I’m ready for my next viola or violin, I’ll inquire here. I once bought a very reasonably priced quality viola online from a vendor named Belri Music. I don’t know if they are still in business, but if you can find a used Belri viola, I think you would appreciate the quality and tone. Hope this helps!