I got a venemous-x and I've got my i7 sitting at 4.2Ghz and my temps haven't gone above 67 degrees celicus.
I also overclocked my 5770 to a 1GHz core clock and 1.35GHz memory clock. my max temp on that is 81 degrees.
I stress tested both the CPU and GPU for 3 hours each without crashes. Are those decent temps or could they go lower?