Don't set your whole opinion on a brand by one style in their line. Gildan has very comfortable, soft, and well-cut styles in their product line-up. I am guessing that used the generic 6.1 oz. 100% tee from Gildan.
Check with your supplier, Gildan just released a 4.? oz. tee that is combed-cotton and rivals the fabric sold by much more expensive American Apparel.
If that doesn't do what you would like, than try Anvil's Combed Cotton tee. I have used it plenty in the past as an economical alternative to AA. Once Gildan's new tee is more widely consistently available, I will be switching over to them though.
To purchase blanks I use both
One Stop - America's Best Supplier and
www.alphashirt.com both require a business license, but they have no minimums and very competitive rates. I also receive my shirts the morning after I order them so utilizing a Just-In-Time inventory system is a breeze.
Best of luck to ya!