Playpens?

What play pen works best for chinchillas?

I want one that's large enough for me to sit in with him, but still roomy for him to run around. Of course it needs to be high enough too, so he won't feel like trying to jump it. I see some dog ones that look great, but I'm pretty sure the bar spacing it too wide.. And the critter ones I am finding seem really small, unless it's just the photos.

So suggestions?? Which one do you have? What works best for you and your chins? :))

Thanks!