Strange Boot problem with iMac OSX 10.7.5 (Boot loop, not working safe boot etc.)

Hey guys,
I've got a strange problem with my iMac Late 2009. This morning it didn't want to boot (grey screen with turning wheel). Yesterday when I shut it down everything was fine. Last backup was finished three minutes before. So I was a bit shirty but noch scared of any data loss.
I tried the following things:
1. boot recovery and check hdd (it's a new one, only second day back from apple store for replacing seagate hdd), everythings fine
2. try to boot in safe mode, did not work!
3. try to boot in verbose mode, did work until it stopped. Screenshot of the last lines of log is within this post
4. I used my TM backup and afterwards I could boot! Strange, because as I sad the backup finished a few minutes beforce I left my mac and shut it down
Now I'm a bit scared of shutting it down again But what would be the next step to find the error? My first thought were some third party kernel extensions, but that would not affect a safe mode boot, am I right? I have a Macbook Air here which is setup nearly identical to my mac and it's working. Could it be a hardware fault? Maybe you've got an idea.
Thanks!
Max

at the moment it seems to be a corrupted time machine backup from my old hard drive (new one has a runtime of 27 hours). So I'll will try a clean install of my system at least, when I got the time. sh%&$ !

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