If you want a decent entry level DSLR that you can use different lenses on, have a look at the Canon EOS Rebel T3.

Or if you want a Nikon, the D3100.

Both will allow you to change lenses. If you just want something take casual pictures with and you're not interested in learning about aperture, shutter speed, ISO, exposure, lighting, etc.... I would just stick with those point and shoot cameras you asked about.

If you want to get into an expensive hobby, buy a DSLR. The more you learn, the more you'll spend. So do tons of research, especially on lenses, before you delve into it.

Good luck!