Short of teaching yourself code, you have to act as though all are troubled. But does it matter? Verizon is selling all your information and exact location to third parties. Does that matter to you? verizon.com/privacy. Do you know that several apps in the market start your camera up to look around so as to better send you advertisements?
My advice for reasonable precautions would be to lock the boot loader again once you are finished rooting and ROM'n. Turn off all antennas you are not using such as bluetooth and wifi. Do not download apps from outside of the big name markets like google and amazon. Just assume everything you do, everywhere you go, and everything you type is public information. If you can be okay with that then using these phones will not be an issue.
Is your custom keyboard logging all that you type and sending it off? Android is full of holes such as the new addition of NFC devices.
What info do you not want to get out that isn't already out somewhere else already?
Dave