I just ordered a Calvin Klein Pro Stretch (95% cotton and 5% Lycra). I will let everyone know how it goes. I also looked into George's Bond. They are at www.bond.com.
I too have this problem. I have found that fruit of the loom xk fit me great after thay have need washed and shrunk. A bit tight in the arms but it tapers in and looks pretty good by itself. Its their plain white cotton ones.
I like the CK and 2xist but I seem to shrink them too often. What I tried and it works is going to Sports Authority and buying the UnderArmour or Russell undershirts. They are plain white, no logos, and they keep me cool all day. I also wear a dress shirt everyday. They seem to be a little more "athletic cut". Im 6'1 220lbs 33 waist. My problem with CK was the the L was a belly shirt and the XL fit me like a pillowcase.. Good luck.