K.H.
i have a convertible crib & i love it! right now it is the toddler bed (which is actually more like a day bed) ours did have the sliding side, & then you just take it off for the toddler to make it a day bed (we have a girl, as this kind is prolly not as suitable for a boy) this summer we are going to convert it to the full bed...good luck! & congrats!
if you sell your ragazzi on craigslist maybe you wont feel so bad about spending the money on a new crib if you dont use it as long as you think you might!