Sadly my F700bt was stolen, I am looking to replace it but it sounds like Pioneer took a big step backwards with their navigation on the X series...so...the question is should I find a used F700BT/F900BT or go with the X920BT/X930BT??

i would just go with the new 930, the odds of buying a used F that doesn't have any of the normal glitches are pretty slim.

and if you never had any problem with your F, then the odds are even slimmer of finding another one with out any bugs