The Garmin 92 is probably your best bet for that price. It has a 12 channel reciever versus the old 8 channel in the 90. They both are discontinued by Garmin which means you won't be able to get updates anymore for it
Actually, I've got a 90 and still am able to get parts and updates from Garmin. I just updated the database in April. They just don't make new units anymore.
I'd highly recommend the 90 for that price range. You can probably snag one off Ebay. It doesn't have all the bells and whistles of the new units, but it works great as a situational awareness and backup navigation aid. It doesn't do approaches or anything like that, but since handhelds aren't IFR certified anyway, that's not a huge drawbacks. True, the handhelds with approaches do help you with situational awareness on the approaoch, but with a 90 (with an updated database) you can still track your progress by matching the intersections and fixes on the screen with those on the approach chart. And with the $800 you save by not buying a 196, you can fly more. Not that there is anything wrong with the newer units, they just cost a lot.