As many have said, the 2.7 is a pleasant step forward. I've had the 2.7 for a while now. My digital source is an iMac (I use both iTunes and AudiVarna), my amp is a BAT VK-200 with Harbeth Super HL5+ speakers. If you want to significantly improve the sound, get good interconnects and speaker cable. Get what you want and while they're an investment, I do like Nordost, both Blue Heaven and Heimdall. This system now has Nordost Heimdall 2 throughout (USB, XLR and speaker cable). Each step will improve separation, clarity and soundstage (air) in a significant way. Also, if you have the option on your amp, go with XLR interconnects from the 2.7.