I have (had) a jailbroken 5s running 7.0.6. It was damaged and I need to purchase a new phone. What are the chances it will come with 7.0.6 loaded instead of 7.1? Im depressed about losing my jailbreak more than my phone.
From what people have been posting on this forum (which I know is not necessarily a representative sample), you are more likely to get 7.0.4 than 7.0.6
The real issue, however, is whether you will get 7.0.x that was not updated OTA
I didn't get a 7.0 got stuck with a 7.1. I find this probably the most frustrating part of JBing. Not only do you have to watch what you do with the software but if you need a replacement device you generally get the shaft too. It just sucks.
personally, i would risk it. I'd rather live without jailbreak for a while then live with a hardware problem that could be fixed/replaced for free (assuming you're in the warranty period)