Upgrade from DACMagic? B&W 805S rig


Here is my current system:
B&W 805S Speakers
Cambridge Audio 840a integrated amp
Cambridge Audio DACMagic dac.

Would it be worth it to upgrade from the DACmagic to take full advantage of my speakers? If so, does anyone have any DAC recommendations? I've heard the Benchmark DAC-1 is good. But is it really that much better than the DACMagic? Don't really want to spend over 1500. Right now I think my setup sounds pretty good.
nemesis1218
optical = SPDIF. I'm using an M audio transit USB sound card which has an optical out on it.
If you want to really take full advantage for your speakers, make sure they are placed ideally and then add bass traps in all the corners. Better than spending money on subs, so-called upgraded DAC, or even music.
Try room correction. Behringer DEQ2496 or KRK ERGO. These are not subtle differences and unless you run a really nice analog front end make good.