Openraid and Oqueue are a godsend for lesser geared people. Make a group asking for your Ilvl range and see the people flock onto you.
I've had superb groups that way, who were "undergeared" but still managed 11-13/14.
Edit: Yes, conquest gear is the bees knees this patch. I've used it to gear up my hunter and shaman till around 540 including some lucky drops from ordos/celestials. If you have a supply of gold you could buy carries; it's 150g a win on my server, which means it's like 2k per gearpiece.
From there you can easily get into a flex/normal mode group.
- - - Updated - - -
IIRC Blizz themselves stated around 530 for first 4 and after that it ramps up till it is 550 for Garrosh.