Would be helpful to know the rest of your equipment blindjim. A lot of it is trial and error, getting the synergy right. For not much money I can recommend Cullen Speaker cables and also his XLR's. A friend of mine got some of his RCA's and said they were a big step up from his previous RCA's. Morrow are good value if you buy when heavily discounted. MS Audio Silver litz RCA's and Time Portal Solid Silver XLR's from Sunnytoto on E-Bay are very good. Aurealis in Australia also has some very good cables.
Good luck.
Good luck.