Simple Wireless Computer Audio Setup

I am getting very frustrated with the seeming lack of a comprehensive strategy for setting up a simple solution for computer audio.

One of my daughters is in college, and I am looking to set her up with a simple way to play digital files from her macbook. She is in a very small studio apt w/ wireless LAN, and there is very limited room for gear. I should add that she is a music major and has always had good stereo gear available to listen to. She knows that she will have to give up a little in terms of performance. Also, we are on a budget because... well, she's in college and it's freakin' expensive!

I have lots of stuff lying around, so this is what I was thinking:
1- wireless from her macbook to an Apple Airport Express
2- Connect Halide DS DAC (a USB-> RCA cable set w/ a DAC in the middle
3- Connect the DS DAC cables to a pair of Quad 12L active speakers

Sounds simple, right? Well, you can't get there from here. The Airport Express only supports output to a printer on USB. I could stick another entry-level DAC in the middle, but by the time you add in cables it gets much more expensive.

Other options might include using the Logitech SB Touch. I use these at home and like 'em but I'm not sure that I want to go there now that they are discontinued. I looked at the Sonos, but it has the same limitation as the AE - no USB out. And I have also looked at wireless DACs, but all the ones that I have found (Cambridge, Nuforce) don't work on WiFi but on bluetooth. Why is this is a good idea?

So I am open to suggestions, if anyone has any.