Get 535/540, it's not difficult and despite what a few people say, the gear isn't bad to start heroics and raiding. If you are always going to have a well geared healer you might be able to slack a little bit, but if you are actually going there with people that need the gear and emblems I wouldn't recommend it. If you happen to group with over geared dps or something and are worried about threat you can always ask them to give you a second or two (like good dps should do anyway) head start.

It's not 6%, it's 5.4 or 5.6%, something like that, I forget atm. So if you did actually use resilience get to the right total %. Tbh though resilience and pvp gear (for the most part) is a waste of time and not very good. It only reduces your chance to be crit, it does not increase dodge, parry, miss like defense does.