+1 more for SPD. i've had a set on one of my bikes for over 2 years, no issues at all with them. I also have the Welgo knockoff spd's that come on a lot of Bianchi bikes and they have been great too. My third bike i bought the non-Bianchi badged welgo SPD pedals and no problems with them either. I've got 3 bikes set up with essentially the same pedal system and haven't had an issue with any of them and each set has at least 5000-10,000 miles and still going.
The main reason i went with SPD is becuase they seem to be fairly priced, great quality, great durability, easy to use, and have a huge selection of shoes both walkable and road. It's nice to be able to have a few different pairs of shoes but never have to change cleats depending on which bike you're taking out.
I have heard bad things about SPD about them giving your feet "hot spots" due to the relatively small cleat, but i haven't had that problem and neither has anyone else i know that uses them. I've only heard that on the interntet.
If you are interested in SPD pedals though here's a tip, talk to your LBS, a lot of the times when someone buys a bike it comes with SPD but they already have another pedal system on their other bikes so they get the pedals switched before even getting the bike out the door, and a lot of LBS' will sell these "used" pedals at a bit of a discount. I got the Bianchi ones which were brand new, but because they were already installed on a bike they ran me $20 instead of $40 or whatever.