[sdiy] I2C DAC

[MTG]

I'm almost out of pins, but I have two left in a project that I want to hook 
a DAC up to for control voltages. Anyone recommend a decent I2C single or 
multi-channel 0 to 5v voltage out DAC?  What are most people using for 
resolution of control voltages these days? I know 7-bits was the standard 
for a long time. Is it worthwhile looking at higher resolution for things 
like filter cutoff or pitch bend or ... ?

GB