Microchip makes fine devices, too bad i can't get them as easily as i'd like here.
The one i'm using: DAC6573 data sheet, product information and support | TI.com
no module, only the chip
10 bit quad DAC, i chose I2C specifically over SPI as SPI needs 3 wires and I2C is already builtin in the Atmega(albeit hardwired and you lose 2 analog pins), so i'm using several I2C devices in my project, makes everything much simpler.
now on what project to use it... good question... i'm using it for a programmable window comparator and current sink, thus 3 outputs..., no need for more than 10 bits as well.
and another thing i hate is how all these i2c devices are SMD!, ohhh i hate SMD with passion....