I was all about co-sleeping, it's absolutely what the plan was; I did have a Pack N Play, "just in case" (my parents bought it for me). I guess I have an odd kid, since my 1st DD couldn't stand the least wiggle when asleep or she'd wake up, & liked it much cooler than I do (I have to burrow in, or I freeze). So after trying to get her to sleep with me, I gave up, & put her in the Pack N Play right next to the bed, where she was happy as could be, & her sister turned out to be the same way. We're in a tiny space to live in right now, & both girls are petite, so at nearly 3 years & almost 2 years, they still each sleep in a Pack N Play next to us (I call them their "child nests".)
So I guess I'd keep the Pack N Play until after your baby's born, just in case.
: : SAHM to : (5/06), : (7/07) Plus : & a few