Weight was the first thing I looked at. I found a great pram in my price range but couldn't even lift it!!LOL didn't buy that one.
Depending what you want it for it's often good to check out the tyres & how well it handles lots of wanlking, rough surfaces.
I also looked at steering, I wanted something I could manouver with one hand as often bubs wont settle or people are not willing to hold the door open for you!
Ahh think that's what I found important.