I realize this is extremely subjective because there are so many variables to look for. What's your favorite case? I own an Antec 900 and I love the cooling but I hate the accessibility. I have to get creative with cable management, I have to take a lot of things apart to change a hard drive. I feel like there have to be easier/more fun cases to play with!
I had the Antec 300 and had the same opinion. Nice airflow, horrible accessibility. I think I counted once 12 screws had to come out just to get to the HDD cage to add/remove a drive... Yuck...
Right now, my favorite mid-tower is the
Lian Li Lancool PC-K62 for only $99 (can find it now and again for ~$80 during specials). It has similar airflow characteristics (better actually) as the Antec, plus filters and all the easy-access items we like as well as a quick card disconnect system and tool-less HDD storage system that actually works while also being very secure. I've built two dozen different gaming rigs this year and this was by far my favorite case (so much so I bought two of em, for extras...). But there's a lot of very good cases out there also. This one did everything I wanted it to. Easy access, filters, good airflow, positional HDD options, and even room for the very long cards if necessary.
It has three 120mm exhaust (two top, one rear), one front intake and the PS has a bottom optional intake (PS mountable either way). Filters on the intakes.