The perfect GPS for off-road bikes!
Well, that being said I don't think there is a perfect GPS for off-road but 
 there are some really good ones.  I've done alot of research on them and
 I've decided on the Garmin 60CSX.  They run about $250 to $300 new and
 seem to hold their value well because I haven't found a good deal on a used
 one yet (used $200 to $300!).  I narrowed it down to 3 models which are 
 listed below.  I could post some links but the easiest way I found is to go on 
 google.com and search for: 
                      
garmin 60CSX vs Colorado vs Oregon
 The Colorado and Oregon are newer but I found they aren't quite as accurate
 as the 60CSX and they don't show up as well in direct sunlight (I live in  
 Arizona where it is almost always direct sunlight unless it's dark!)  The other 
 have a more 3-dimensional look to them for the topos but are harder to 
 read in direct sunlight.  I am also 50 years old and if you look at all of the  
 screen shots that you find on these GPS forums of the 3 units, the 60CSX  
 is the easiest of the 3 to read.  
  Just my 2 cents worth.  Hope it helps. 
 
 Tom