Seconds to Morrow Audio [SP7] and Cardas [Clear, Clear Cygnus]. I agree that no entry level cables sound good, something I really hoped was NOT true...but every time i have upgraded, I gained more detail, or bass "oomph", or something SIGNIFICANT [there's that word again]. I do NOT agree that that means you must spend $10,000, as someone chimed in above...
I also use Anticables in my 3rd setup, their current top of the line, which is well under your price guideline.
Unfortunately for my [our] wallets, cables do matter.