batiks are awesome, the colors are so creative and each piece has so much depth. I use mix batiks with screen prints all the time. pre-wash is a personal choice, i don't normally, when I buy from Sewbatik, I do, as they strongly recommend it for their fabric, and I have had them bleed (in the wash tub, thank goodness!) most other batiks I buy are mostly hoffman, kaufman and mode. as for wrinkles, i haven't had that problem.
experiment and have fun!