Almost all of today's camcorders can do what you want. Just look where the playback controls are. If there's a record button (REC), then it can take an external video/audio source. However, if you are in the market for a camcorder, why not look at on...
The lowest price you can expect to pay for a DVD camcorder is around $250 to $300. I would recommend the Sony over Samsung. Here's a good website to learn more about DVD camcorders:
While there are a number of camcorders now using USB exclusively for transfer, almost all of those camcorders record to either a hard drive or flash memory card. They use USB because all computers include a USB connection while many still do not have...