Our daughter co-slept with us until we got a toddler bed at around two and a half, or a little sooner? It's all kind of a blur...but I have to say that even though she was in her own bed, I was nursing her to sleep and often falling asleep with her until around 3 years old. So, technically we were still co-sleeping, and we decided that if that was how we were going to get her to sleep (one of us laying down with her and telling stories, singing, etc.) than we might as well make it comfortable for us and we got a twin. Luckily we pressed on for her to sleep in her "big girl bed" and a couple of nights she fell asleep on her own when we moved when she was 4, and from then on she was going to sleep all on her own. We loved co-sleeping, but we also liked it when she moved into her own bed because most nights my husband ended up on the couch (DD is a bed hog! =)
This go-around I think we are we will side-car a separate bed next to ours and use a crib for naps when DD is home. We'll feel out how soon is right to move this one into his own room, because 6 months (or even under a year) seems SO young, but the 3ish years of co-sleeping was difficult for that time in our marriage --it was like we never saw each other because I would fall asleep when at around 8 with DD which was right about the time my husband would get home, and then we'd sleep in and he'd be off to work already and we wouldn't even end up in the same bed!
That was then, and this is now, so we'll take it one day at a time.
*I just read my post and it is kind of scattered, hopefully it makes sense!*