*technically* because DV-AVI isn't totally lossless, you will lose some quality, but considering DV-AVI is so much better than DVD anyway, unless you keep re-editing the same file about 100 times*, you probably won't notice a difference
If you're that bothered about losing quality, you can always edit your stuff in a lossless format, for example HuffYUV or even RAW format. But RAW is HUGE.
* possibly exaggerated