We bought a cheapy Target crib for show since my IL's are crazy against co-sleeping and we didn't want to fight that battle. However, we ended up getting a lot of use out of it. It served as a handy playpen while I showered and he would nap in it. One little known fact re: cribs that my back surgeon shared w/ me--they're absolute hell on your back. So once my back went out we switched the crib to the clean clothes holder, which works really well too!
Personally, I have high hopes that #2 will nap in the crib although my back may say no to that as well. IMHO a crib is safer than the bed when they're by themselves-- rolling, etc. I think a crib can have a place in a family bed family.