Goertz is a fine recommendation. You could also consider Nordost Solar Wind or Audioquest Type 4+. Kimber 8tc, and DH labs Silver Sonic T14 also. Someone here had a LAT International pair for sale a few days ago, might check that out as well. $100 actually gives you many solid options.
If you want to take a REAL step up and can spring $120 for 1 meter ICs, try Mapleshade's new Clearview Ultrathins. Caveat: they're fragile and don't take kindly to children and rambunctious pets. But they're extraordinarily good for the money.
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