I'm extremely picky about the fabric and printing quality of the t shirts that I buy, so deluxe t shirts printed on american apparel with burn-in ink would be nice. I'm a big fan of fangamer's t shirts, and they use "forward printing" for all their t shirts. You'd likely need to change from decal style art to a more limited color palette, but it would make the shirts last longer and I would definitely purchase them.
This is the printing companies website
http://forwardprinting.com/
This is an example of using a limited palette, note that the design only uses 3 different colored inks, while using the background as a modifier.
http://www.fangamer.net/products/chozaglyph