Second baby seems to be on budget:(

I have kind of hard question., I have a baby boy born last march (almost 18 months old), and last year my husband employment was blooming we were buying everything possible and impossible for our little one (we have pretty much everything.. Including 3 expensive strollers ..) and i really want to USE stuff we already have instead of buying more... now i am almost 30 weeks pregnant and we are expecting a baby girl in november, things has changed very fast and we need to stick with a budget.. So i have a crib-bed-bassinet question...! My son still sleeping in his crib., which is pretty simple., and i was planning to buy a stokke sleepi (bassinet->crib->toddler bed etc more than 1500$..) for the girl., but now i think will it be fair enough to move him to (twin bed/floor bed/single bed) and use his crib for upcoming baby., or it is unfair or too early. My husband wakes up very early for work and he need a good sleep but i afraid that if i move my son to lets say regular twin bed with a safety rail or i was even considering floor bed (so he won't fell) so i thought we will end up to wake up all together.  

Heres some pics

1.Heres my son bed that i was going to use for little one. 

2. Floorbed the one i was consider for my son as a transition before regular frame with mattress