I was considering only bidding on either the helm or chest of the T5, and then grinding arena to fill in the other spot. I would probably only have the DKP to win one item, as we wont be on Kael/Vashj for much longer (T5 is a fixed large bid for us). The S3 items have a crap ton of Stamina and some good threat stats.
Currently I have T4 in both slots, so either T5 or S3 would be an upgrade. I'd of course gem all of them with Solid Stars.
I currently swapped my t4 chest for an s3 chest but im waiting to see the threat differences(we raid on fri). Only thing im currently concerned about is these kind of upgrades lead to falling SBV stats. Im wondering what the lowest i should go in SBV in lieu of other stats.
most set bonuses suck lol, but t5 set bonus isn't terrible its good boost to threat but 200 haste on a tank isn't gonna suddenly make him an AWESOME threat machine, it only increases your white hits, and in turn your HS queues. hardly noticeable imo. you'd have to ask one of the tanks who have 4/5 though.