Beware, you get what you pay for. I don't know what your system consists of, but if you have spent the money to get quality components then please don't try and save a few bucks on the cables. You may as well bought an amp and preamp of much lesser quality, because that's the way it will sound using a db25 connector. I've tried them to see how they sound and believe me it's not worth it. If your that worried about cost, just get a decent used pair of RCA's. But if you want the most out of what you paid good money for (AMP and PREAMP), then I would recommend a quality balanced XLR interconnect. You don't have to spend thousands of dollars on your interconnects, but remember, you get what you pay for. If you tell me what components you have, and what your willing to spend on quality cables, I'll give you some suggestions.
Good Luck.
Good Luck.