James - your price puts you squarely in the 911 "sweet spot" (IMO) of 1985-88. That vintage is the 3.2L Carrera with the superb G-50 transmission. A low mileage, clean 911 in that bracket should sell for $20-$24k (depending on location), and could definitely be a "daily driver."
The only downside to this era is a rather anemic air conditioning system, but that can be easily upgraded to modern standards for about $1k. It's worth doing on a DD that you'll be keeping for a while.
And maybe the best part is...if you take good care of it and don't put 20k miles a year on it, the car will probably not lose much value over several years of ownership. It may even appreciate slightly.
I sold my Black/Black '88 Carrera to my neighbor two years ago. He's still lovin' it. Those late-80s 911s are bulletproof.
I would suggest visiting the Craigslists for the warm-weather cities (Los Angeles, Phoenix, Dallas, etc.).
For a quick education on buying a used 911 (of any era) get the Randy Leffingwell book "Porsche 911 Buyer's Guide." It's a trade paperback you can probably find on Amazon.
You're not going to find a 356 coupe (A,B, or C) at $25k that you'd be happy driving every day.