The Icom A22 is a really old model, but they still make it. It was replaced a year or two ago by the A23 (the A5 is the same as the A23 without the nav function and it is cheaper as a result). Overall, Icom radios are ok. Nav function on any handheld isn't going to be near as useful as a compass for navigation. Just not accurate enough.
Yaesu (calling themselves Vertex now, their commercial line) also makes some great handhelds. The VXA-700 is the best out there. Especially if ya happen to have a ham radio license, since those frequencies are built in. It is a few $$ more than the Icoms, but worth it I think. Vertex also has models that compete with the Icoms for less.
There are other companies out there, that sorta make handhelds. Old or new, buy maybe still around on eBay. Sporty's, JRC, Bendix-King, Telex, and I'm sure a few others. But for current small, bring with your models, it is basically an Icom or Vertex choice.
http://www.avionicswest.com/Transceivers/vxa-700.htm
http://www.avionicswest.com/articles/a23.htm
Those links will give some basic info/reviews.
http://www.avionicswest.com/ica5.htm
The price on the A5 was just dropped. $250 is pretty cheap, and likely the best deal out for the moment. Usually price drops mean new models soon though, so something to keep in mind. Could just be they were way overpriced compared to the Vertex models, so they had to drop the prices to compete. Keep away from the "sport" models Icom has, unless you have stock in Duracell.
Avionics West seems to have the best normal prices. You may do a bit better if you scan ebay for a week or two for a deal.