My DD2 has been in a big girl bed since 15 months. She wants to be with her big sister, who is 2, and simply wouldn't settle in a cot anymore.

We got both the girls a bed frame from Freedom - cost $150 each on sale - and then a good mattress from Bedshed. DD2 has bed rails that we got from Toys R Us.

I think a king single is a great idea. We spend a good deal of time in one or other of the girls' beds and the extra space would be nice - and if its like that now imagine what it will be like with a 5 year old!!