Marble runs- which one?

[bringontherose]

Hello
Advice please on marble runs. My DS is 4 1/2 and loves these. I am just not sure which one to get. I don't want anything too bulky so it is easy to put away. Any advie would be great.
Thanks

[blametheparents]

We have the ELC one and it has been great. They also do an extension pack now which I might get.
It has been a very well loved toy and has had loads of use.