The Canon is a fine camera as well, though I have to give my vote to the K1000. I've been shooting mine for more than 20 years. It's a tank, the lenses are great, the light meter is simple but reliable, and it never lets me down. Pentax also seems to always give comparable quality for lower prices, so you get more quality for your money.
Fine camera in its day, but there seems to be some shutter problems after all these years. What about a Nikkormat? The main thing, whichever brand you buy, is to get one that has not been abused over the years.
I just picked up a Canon T70 cheap. Easy to use. Auto film advance, loud, but takes great exposures. FD glass is very good and shocked how great the first couple rolls turned out.
I have a couple of K1000's that need service but one still works. I am going through it and giving to my daughter, it will be like new. Great camera, great glass, and perfect to learn with. She will get a 50mm f1.2, 35-105 f3, leather case, Pentax flash, filter set, and 5 rolls of B&W 200