At present, the best basic T-shirts for quality, price, color selection and availability are the Gildan 2000 and the Gildan 5000. The 2000 is a standard heavyweight T-Shirt, while the 5000 is a medium weight T. Both are 100% cotton.
These days, it seems like the hipsters and kids prefer a lighter T-Shirt like the 5000, or even the American Apparel 2001. The baby boomers like the heavier T's like the 2000. The American Apparel 2001 is pricier than the Gildan styles, it should be noted, but it's a darn nice shirt.
You can view color charts for at the highlighted links above, and with the 2001 color chart you can click on the color to see it modeled.
We are all about quality and service, putting the shirts you want in your hands, printed just right, and on schedule.