Poll time!

DS is turning 3 soon, and shows no sign of climbing out of his crib (knock on wood), but does like the idea of sleeping on the floor and has asked to do it a few times. I'm tired of spending 5am wake-ups with him in the glider, so I'm thinking about switching him to a bed soon where we can both cuddle lying down instead of crammed into a chair and hurting my back.

Question 1 is whether or not we really want to do this (my back says 'yes' but I'm scared of what will happen at nap/bedtime...)
Question 2 is what size mattress to use, regardless of when we decide to make the switch.

If space and money was not an issue, what would you have done? And when would you have done it? (multiple choices allowed)