I currently have Rudy Projects and am happy with them.
For me it's not so much about the brand as they style. I look for "rimless" (bottom half) glasses with interchangeable lenses.
The lens colors that are "must haves" for me include brown (sunny conditions), persimmon or red (overcast or changing conditions) and clear for shaded singletrack and nightriding.
If you want to stick with Oakley you could try the Half Jackets or the classic M-Frames. Other brands that offer rimless interchageables include Bolle, Briko, Rudy Project and Perfromance's house brand (to name a few).