If I was looking at budget DSLR I would definately buy used. First cameras don't just expire from normal use, for the average person a camera can last well over a lifetime. There are things to consider but nothing complicated:
Research the camera ahead of time consider the following:
Shutter count:
Usually not a big deal although others here seem to think otherwise. You can check the shutter count in EXIF data, take a picture in RAW mode and use EXIF viewer or photoshop. You can google various procedures for different cameras but it's a fast and easy process. Typically this number is low, most of the DSLRs for sale are result from lack of use. For example I've had my D300 for 4-5 years now and I would say my use of it is probably average, mostly I take pictures of my tank and while on vacations. My shutter count sits at 7617 on a shutter designed for 150,000+ so you tell me if this camera is worn out. If you buy from pros or wanna be pros you'll find higher numbers but you can avoid these people pretty easily. Worst case let's say you have a very high number, does that mean the camera is shot, no you get a new shutter installed which for entry level DSRs can be done for as little as $100. You'll also want to check the firmware to be sure it has not been updated, this is also easy to do and most people don't update. If it is updated might be best to avoid as this can reset the shutter count.
Sensor:
Next check the sensor for dust or bad pixels. This is as easy as taking a picture of a clear sky or something consistent in color but not black. Examine the picture on a PC screen and look for any imperfections. Any dust or bad pixels will be fairly evident. Most sensors can be cleaned as well but best to avoid anything you're not comfortable with.
Overall condition:
You can figure this out, if it looks pretty beat up then avoid, typically the aesthetic condition is a pretty good indicator how the camera has been cared for.
That's it really, you can save a ton of money buying used and if you're not that serious about photography it's the clear choice. If you find yourself not using it that much you can probably sell it for what you paid for it or at least your investment isn't as great as if you bought new.
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