MacBook Pro into a Airport Express; digital out into a Grace M902 into a pair of McIntosh MC30s that were just refurbished. Speakers are Avalon NP2s. A great sounding system, especially for the Europe '72 stuff, although hearing it at Airshow, while David Glasser mastered it, was pretty awesome. He uses big Dunlavy speakers that are some of the most coherent sounding speakers I've ever heard. It was like the band was right there in front of me. I highly recommend Mac tubes. I was a complete skeptic until I got mine refurbished and then was blown away. The first vocal music I heard through it was MeShell N'DgeoCello's Peace Beyond Passion and I was stunned at how slamming that album sounded. I never thought 30 watts of tube power could bring the funk like that.
The Grace headphone amp as a DAC works really well and with this system it handles everything from CDs to FLAC to mp3. The speakers are on a switcher so for movies I can use my bargain surround rig, which consists of a Yahama 7.1 receiver and Paradigm Mini Mk. III rear speakers and a Tannoy TS8 sub. All of that was gotten used except the Yamaha, which was on serious discount.
My home studio rig is an Apogee Duet 2 (unless I drag my Metric Halo ULN-8 out of the live rack) into a McIntosh MC2105 and ProAc Studio 100 speakers (what Joe Gastwirt has used for mastering a lot of the GD catalog). Great sound and really responsive to EQ and level changes.