Install some new fans, get a side door with lots of holes, overall might wana get a good case.
I have 6 fans + 3 cpu fans, a giant vacoum like thing $ucking air from the side door, I have modded both side doors so they have these 30CM fans blowing air in and out. Also i keep my room freidge hooked through the inside. MY CPU TEMP NEVER GOES OVER 31C, usually stayes at a good 19-25C. I consider 30 A VERY VERY HIGH TEMP.
Well 70C, i would freak out and go nuts! Get more and better fans.
Casual (AMD 4000+ x4) (Stock mobo) (750 Gig + 8 TB Xternal) (150 RAPTOR) (9800GT OC x2)
(OCZ PowerStream 800 Watt) (2G OCZ) (XP/Vista)
Torrenter (1.05GHZ) (Stock mobo) (250GiG) (9200 Radion) (Stock PSU) (768MB) (XP)
Laptop (Intel Core 2 Duo @ 2.8Ghz) (2G) (8600GT) (XP/Vista) (500GiG)