I think all camera brands allow you to open raw, although the processing may be a little limited. For example, Nikon View (think latest is NX) is free and allows raw processing, limited option but I had found it usable. And Canon ships its own raw software with the camera AFAIK (you need to confirm).
The last option is to get Photoshop Elements, currently in Version 7.
But definitely buy DSLR first. No camera but got Photoshop is, to say the least, strange. And by the time you save up for a DSLR, your photoshop goes obsolete.