I have my macbook plugged in to my PM 5003 but can't help feeling the sound is lacking compared with my CD 5003 which uses the Cirrus Logic CS4392. I am using lossless on the mac. I don't want to spend too much what can you recomment? (under £150)
I can heartily recommend the Fubar IV, which just about sneaks into budget. They have other cheaper ones (like the 2) but they may not suit your needs (the 2 is only 16/48 capable, for example).