I've got a 1200 and my friend has a 900. I love them both, but they're a pain in the rear to clean the filters on. There's 8 screws per drive cage to slide out the cage and access the filter. Even if you just leave in one row of screws, you'll have 2 per cage to clean the filters. It's a pretty serious design flaw I think. It makes me never want to clean my case.
For that alone, I might recommend the 410, but without ever using a 410 I can't vouch for the build quality. Tom's loves it though and it's a good looking case. Reminds me of an alien.