Beware of some of the entry level cameras, though. I know someone who has one of the cheapest Minolta SLRs. That thing has horribly slow autofocus, and allows absolutely no manual control over exposure. The higher end Minoltas are fine cameras, of course, but they may also be out of your budget. The Nikon or Canon models suggested are fine, especially if you want to start building a collection of lenses to move over to a DSLR someday.
Throwing more money into an inherited screwmount (or other outdated) system is a very bad choice, as I now know from painful personal experience. The old Mamiya 1000DTL was free from the unused-in-the-past-20-years pile in the parents' closet, but the accessories and related stuff has certainly not been; after this time I regret not getting into the Nikon system from the start (I love macro so am kind of partial to Nikon).