I dunno -- I used an ex-pen for Jackson so I really don't have any advice on the playpen. The expen seems like it would give them more room and it's really easy to fold up and move. Plus you can kinda shape it however you want. Sometimes I would make it circular and sometimes I would make it kind of like a big rectangle depending on what room we were in. I got a big expen for around $55 at Kmart.
Good luck with your new little one!!!
You can kinda see it here in it's rectangle shape, but it really goes in a circle.