I literally just posted this a moment ago but in my opinion can't go wrong with the HAF-X. I may sound like a broken record, and I've only had few cases. But the HAF-X has some great airflow i'm running an i7-2600k @ 4.8 Ghz (with corsair H100 that looks tiny in this case) and SLI GTX 580 OC'd to 860 MHZ, and all i added was a second top 200mm fan. And the case is so nice and large that I'm upgrading to a dual 360 rad water system set-up thanks to the help of some people here on the forums. Love this case, very affordable to.
Edit: Sorry you mentioned HAF-X not having filters. It in fact does have does filters. The one at the bottom by PSU is quick and easy pull out. However the top 2 filters and the side door filter require taking off the top (for top) and taking side fan off for that one. not a simple easy slide in out but it's not a major hassle either.