In reply to GingerBread22:
> would you recommend SPD or SPD-SL (I wont be doing any walking on them), just purely based on performance?
I have both on different bikes, and I must say it's hard to notice a big difference in performance between them, but I suspect it's one of those marginal gains things where perhaps SPD-SLs give you 1 or 2% better efficiency and that sounds nothing. But for example, on this ride
http://lightfromthenorth.blogspot.fi/2012/06/big-ride-kangasala-vantaa-190-... I worked out I must have turned the pedals 30,400 times, so a few percentage difference there is really a difference!
The second VERY important thing is that road pedals on a road bike look right! You will ride FAR better if you look the part.
The float is on the yellow SDP SL cleats is excellent. I got knee problems from my old Miche pedals, just swapping to the pretty cheap and basic SPD sls solved that for me, I think simply because of the float.
Do not estimate how crap SPD-SL cleats are for walking anywhere in though! Want to stop at shop halfway round your ride for a mars bar? Be careful! Think ice skating.
So for any type of touring or biking to somewhere to visit etc. SPDs are much better. Had to push my mountainbike for miles through unrideable forest whilst bikepacking at the weekend, and in my Mountainbike shoes it was only very frustrating and hard, rather than an utter nightmare.