What's the best digital camera that can be bought for $600?

depends on what features are important to you. Canon powershots are great quality point and shoots in that range. You can also get the canon digital rebel SLR for $600, but that is for the body only. You also need lenses, batteries, media cards, etc. Go to dpreview and compare the features you want and your total budget for camera AND needed accessories, then go from there. Also look at similar questions that have been posted.