I got a Garmin 196 last Sept and absolutely love it. Great as a back up. You can line yourself up with the runway centerline miles out. Nearest function is great for finding FSS/airport/center freq./and many more. Battery life with rechargeable batters is about 12-16 hours with back lighting on. It's been a great flight companion these last few months and I just ordered the new Garmin 296 which is basically the same as the 196 with the addition of a color screen and terrain cautions and alerts, sectional chart-like topographic data, a built-in obstacle database.
You could probably pick up a 196 on Ebay for around $700