Oakleys are awesome if you don't break them....if you do then they're a complete waste of money! At the cheaper end of the market, Sunwise are pretty good, Slazenger Elite specs are dead cheap at Sports direct and come with different lenses and on eBay you can buy 2 pairs of Woodworm specs for about £15 posted. Not particularly flash but decent enough lenses (uv400) and cheap enough so that if you do break them you don't need a bank loan or another payday to come around in order to replace them...