If they don't hear from me it's normally because I'm training.

I'm exactly your size and I've got 3 Do or Die Gis. We're right on the edge of A2, but better of going A3.

One of mine is an A2, which fit like a tailored suit right out of the bag. After a few washes, the sleeves and pants became too short. Conversely, my A3s were a little bit straight out of the bag, but after a few washes, became the perfect fit.

If you want to get the longest use out of your Duke Gi, I'd say go for the A1. You'll need to shrink it a little bit once you get it, which is a better route than getting an A0 which fits at first but over time becomes a tiny Gi :)

awesome. I got the A1. :)

A1 won't work for someone 170 lbs, so you'll need an A2.

Shrinkage is negligible if you wash cold and hang dry, but if you wash warm and/or use a Medium Heat cycle, you'll get standard shrinkage out of this one.

A2 is perfect for your height, A3 is perfect for your weight. Whenever someone is torn between two sizes it's always best to go for the bigger of the two.

If you got an A2, it'll be too snug.
If you get an A3, it'll have the perfect amount of roominess but be too long at first. Shrinking it down may get you the proper length, worst case scenario it would need the cuffs taken in an inch or two.

I am 5'10" and 195lbs... I bought A3 based on the same reasoning... Dryer should make it perfect ;)