85L is a very nice lens. Be sure you're ready to commit to it though....its very expensive, and the focal length and AF make it very specialized, and difficult to use for anything other than of outdoor portraiture. I love mine, but its my least used lens. When I do use it, however, it does what its intended to do beautifully.
I'm not sure why you think the 85mm can't be used indoors? Over the Easter weekend, I took some indoor portrait shots with a 100mm lens and it worked out fine. The only issue I had is there were several shots where I really could have used my 135mm (f2) lens, but I didn't have it with me.