be careful on using old 35mm camera lenses as the focal lengths aren't the same. The sensor on a digital camera is smaller, so there is a conversion. A disaster if you try to use an old wide angle lens. I have a great 24 mm Nikon lense from my 35 mm camera, but on a digital nikon it's the equivalent of a 36 mm lens, not at all the same. better with telephoto, as a 200mm lens becomes the equivalent of a 300 mm lens. It because 35 mm film (size with sprocket holes) has an image size of 24x36 mm, the digital sensor of a digital camera is smaller, thus the 'smaller" lens sizes. A "standard" lens for a 35mm camera is 50mm, for a digital, it's about 33mm.
So, my 24 mm wonderful old lens is no good on my digital, but my old telephoto zoom (70-210mm) is now like a 105-315mm zoom. Also, many of the lenses will have autofocus that still works, some won't. I am just going to stick with new lenses made for digitals. The Nikon series has some great values in their reasonably priced digital lenses (I like their lower priced lenses better than others), but the pros are evolving into Canon more and more (but at over $1k per lens)
In many reviews, the Nikon D40 and D40x are getting best buys for that level camera. Canons are also great cameras, but I'm a loyal Nikon fan.