Originally Posted by gw280

I don't know if it's within your budget, but I thoroughly recommend Speedplay pedals. I used to ride Look Keo pedals which are very similar to the SPD-SL road pedals by Shimano, but found that I'd get a bit of knee trouble, and that all went away when I switched to Speedplays. Plus, they're double sided

If you're only doing it for recreational that's what I'd recommend anyway. Weight savings really shouldn't be a factor when choosing pedals. Choose the ones that are comfortable and right for you.