two weeks ago arrived on Etihad landed 6.50 got thru fastrack and was checked in at Thai before 7.30.
You might want to book VIP arrivals service at
http://www.facebook.com/group.php?gid=126223595856An agent will wait for you at the gate with your name and accompany you all the way to Thai check in for a price.
I flew business class and as such get fasttrack card and priority luggage delivery. Was thru immigration in a few minutes and had to wait an other two to collect my 53 kgs bags
Even without that service I think you will be OK, count 1h max to get thru imm and collect your luggage, just try to get out the plane early and hurry to imm.