I got new irons this past fall. I went to a course with an out door range and spent a day hitting different clubs. At the time I was playing MP-57s but I needed something more forgiving because I just dont have the time to play a lot anymore. I went with the intention of getting into another set of mizzys. I hit about 15 diff. sets of irons and bought the one set I didnt want to even look at. Thats right I went to the dark side , Taylor made. I am a TM hater, just never liked them. But the burner 2.0 are just incredible, so easy to hit. VERY VERY forgiving in the long irons. The 3 iron is actually fun to hit, heck I didnt even carry a 3 before.
Just get fit, it makes such a big difference. I'm 6'2" so I'm about your size and ended up with +1/2" and *2 upright.
One more thing, when you go keep an open mind and dont rule out anything. Also do some homework and get an idea of the going prices.