I'm kind of inbetween as well. There are nice lightweight ones with a good drape, esp if they are not tightly knit..
I think some look good when they are cut assymetrical(sp?) I reaally hate the ones that have the hem cut straight across your hips, hiding your arms and waist - thus the tent effect.
I have only one, but the hem comes to a point in front of my hips, and the neckline is large and exposes a shoulder. So you can still see a lot of arm on one side, and my waistline is visible (very important!). It's a neutral dove grey and looks amazing with my Sevens and Fryes.
If it circles when you twirl, then you have too much fabric up top. If you're petite, don't attempt. And stay away from busy knits patterns and colors.