New here and would like to jailbreak 3GS, but already on 6.0.1

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I've been given (yes so nice!), an iPhone 3GS, with ios 6.0.1 already on it. It has new bootrom 359.3.2, never been jailbroke, and factory unlocked. No SHSH blobs ever saved. I want to jailbreak, so researched and saw first thing is to save blobs, but TU says its not possible now. My question is can I still go back to ios 5.1.1 to do an unteathered jailbreak and not worry about blobs? Or, should I wait till unteathered JB can be done with ios 6? I don't want to do teathered JB just in case I have to hard reset away from PC.

Connected devices:
iPhone3GS 4.1 (8B117)
iPhone3GS 6.0.1 (10A523)

TU shows this in logs when trying save blobs

12/04/2012 10:03:36.169 For version [iPhone3GS 4.0.2 (8A400)] - This device isn't eligible for the requested build.
12/04/2012 10:03:36.176 For version [iPhone3GS 3.1 (7C144)] - This device isn't eligible for the requested build