The standards are Sound Forge (from Sonic Foundry), Cool Edit (Syntrillium) and WaveLab (Steinberg). Sound Probe (Hisoft) is a cheap and good editor too. Depending on your needs, you might get away with light versions of these editors. I recomend you download demos of all the editors as personal preference plays a big part in using these progs. Personally I favor wavelab for quick recording and soundforge for editing, but all of these are very good.
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