Need interconnect advice

Good day all. I need to replace our interconnects, and need some feedback from you on your experience. I am looking for cables that will smooth out out a slightly grainy digital source (mid-level DVD), but am also looking for good detail and quiet backgrounds. The amp is an Antique Sound 2x15 integrated (using Svetlana KT-88's), the speakers are Mordaunt Short 2-way monitors, and speaker cables are Audioquest Crystal. I would like to spend no more than $125 for the pair (.5 meter), and the main quality I'm looking for is smoothness, followed by "blackness" and then bass. Please share your experience and thanks for your time!