I'm not too fond of the 900, I think it's too big. But, it comes down to personal opinion really. I've never seen the akasa, but you can't go too far wrong with Antec. I think whatever case you get you'll be pleased, unless you start comparing it, then no matter what you'll wish you got the other one
. (I often wish I had got a solo instead of a p180, so much easier to carry! - but where would I have fit everything in lol)