Thanks also for your input, Deb! Hmmmm, I do have an 80 gal. tank that I haven't setup yet (it was my ex-hubby's saltwater tank that I inherited, and I'm converting it to a freshwater tank ... but decided to work my way up to that by starting with smaller setups). I just don't want to use the large tank primarily for 1-2 turtles, cuz I want lots more fish and other creatures. That's really important to me ... would really help to make me feel that he'll be cheering me on up in heaven when I finally get his 80 gal. tank setup and buy his fav. fish. (He had a total of 4 55-80 gal. tanks as saltwater and freshwater setups - and that was his hobby for 13 years before he died).
Well, how about this ... if I did get a small turtle, such as a Stinkpot (Musk), Spotted (if I can find one, cuz they're pretty rare now), Eastern Mud, Striped Mud, or Reeves, and kept it in a separate tank ... would a 2½ gal. setup be sufficient to start with for a baby turtle? Then, as it grows, move it to a larger tank? I already have another 10 gal. tank that I could put it in. And, I'd be willing to buy a 20 gal. later, after it grows more and needs the additional space. Do you think that would work?
BTW, in general, how fast do turtles grow? I've done a lot of reasearch on them over the past 6 mos. (just still don't know all of the different types there are), and have found that numerous people claimed that if the turtle's living quarters is too small, many do not increase in size much (some do and some don't - just depends on the breed).
I really, really want a small male turtle, and I'm willing to accomodate his needs.

Thanks again for your help, everyone!
****EDIT: Oh, sorry, one more question for now. I know that for fish, the basic rule is 1" per 1 gal., but it appears that the turtles need much more than that. What's the ratio for a turtle, cuz if I do get one, I'll need to keep myself aware of his size as he grows to accomodate properly.