Speaker Cable for Tube SET System?

I would like some (tried and true) recommendations for speaker cable. My concern other than overall sound is bass control (damping and what effects it, if this is a part of the wire puzzle). The system is: Audion Silver Night 300B stereo version (7.5 watts), Reynaud Twin speakers, CAL Icon MKII with Bel Canto DAC, Mapleshade Digital IC, Homegrown Super Silver analog IC, BMI Whale PC's and two Monster HTS2000 power conditioners. The only two cables that I am considering at this time are: the Mapleshade Single or Double Helix and Analysis Plus Oval 12. I can get by with 10 ft runs, but would prefer to have 12 footers to cover any future reconfigurations (or to use them in a second system as time goes by) and would like to keep the cost at $300 and under. I am currently using Kimber 4VS and would like a more natural sound than they seem to offer in this setup, plus bass control as mentioned before. I will probably only audition two to three cables at the most and or buy and then sell used if I hear no improvement. Thanks.