I bought my 3 year old daughter a Tiny Bike - you can see it here: www.fun4kids.co.uk/bikes-ride-ons/balance-bikes/tiny-bike/tiny-bike.html
It's super light and she can pick it up with one hand - she loves whizzing round on it and it's really good quality - the pink is just gorgeous!
What I really like though is the footrests - alot I looked at didn't have anywhere to rest there feet whereas this has 2 footrests which means when she's whizzing along her feet don't have to just stick out
I was going to get the Strider but it looked a bit expensive for what I wanted but this does the job just fine