Getting persistent entry guards is one of the best things you can do. kmf and I have been saying that for months, at least since the Trawling for Hidden Services paper came out, and as recently as a few days ago: http://dkn255hz262ypmii.onion/index.php?topic=209514.msg1512060#msg1512060 That being said, if the adversary controls an AS or IXP between you and your entry guard / bridge, you can still be screwed (see the link above).