Acer AX3400G-U4802

Noob question, Never worked with a small case like the Acer's but can a GeForce 8800 GT fit in a Acer AX3400G-U4802? If not I assume I would just need to get a bigger case/PSU? A friend has the Acer but the 9200 just isn't doing it for him and wanted to buy him a 8800GT because mine runs great and they are getting really cheap. Any help with how big of a PSU I need and what case size I should get would be great.

Thanks,
Mike