budget Cables / Interconnects recommendations?

Hello all- For the past 10 years I have been using some cheap mostercable type interconnects, and I'm wondering I'f I'm missing out. My set-up includes a pair of VTL compact 100 tube monoblocks powering a pair of NHT super-two's. Main source is a rega Planar 3 (about to hopefully be fitted with a BENZ ACE) with an adcom pre (that I am about to replace, with what I am not sure, something tube I imagine)-- anyways, It seems that I could easily buy cables that cost more than my components. Do they really make that big of a difference or is the money better spent elsewhere? What brand would be a good place to start to do better than my cheap wal-mart cables but not spend a fortune? thanks- M