GPS Question.... Yet Again

Ok, first off, Sorry to do this to everyone yet again.... I can not
find all the information I seek, so I ask all the experts here. I am
looking for information about the units I list below to help me make a
decision.

I am in the market for a protable GPS. I am not sure which way to go,
but I can say for cerrtain the about $600 is all I want to spend.
Pretty much will settle for Grey Scale....

This means I am in the range of Airmap 1000, Airmap 500, Garmin 96, or
if I push the $'s a bit a Garmin 196 may be within reach, but I think
the wife would not be happy if I spent that much on a "toy." Though,
I have tried to be convincing that it is a life saver in the event of
emergency. Did I leave any decent units out that I should also
consider?

So.... Here are my questions...

Airmap 1000 Questions:
-Is the Airmap 1000 a bit too big for a portable GPS device?
-Is the Wrist strap even worth messing with on a device this large?
-Will this GPS device receive signals reliable without use of the
external antenna?


Airmap 500 and Garmin 96 Questions:
-Sensitivity good without external antenna? (In a C172)
-Again, Is the wrist strap worth even trying? Does it get in the way?

Garmin 196
-It looks like this device has the ability to set on top of the dash
in the plane with the antenna exposed through the windscreen. So I
would imagine if left on top of the control panel an external antenna
is not necessary. So, would an external be needed?
-With the previous in mind, is this device usable if left on top of
the panel?
-Can you reach up and accurately press buttons as needed?
-Is the screen large enough to see if left sitting on top of the
Panel?


General Questions:
How do the GPS Yoke mounts work? I do not own a plane and rent, so is
the Yoke Mount easibly removable, or should I forget that idea all
together and just use a wrist strap? Does it work on a Cessna 172
without getting in the way? Is the wrist strap even worth messing
with?


Of the 4 GPS devices I have listed in or near my price range which is
the best all around device for the money? I think the most important
thing to me is the ability to acquire a signal without the use of an
external antenna. I do not want wires running through the airplane
getting in the way and interfering with the flight controls.

Additionally, I want it to be usable while flying without causing too
much distraction. By that I mean I do not want to be head down trying
to figure out what button to push to switch modes. Single button
presses to switch between functions would be ideal.

Since I do not fly long trips a lot, battery life is not of real
concern. I would be happy with about 4-5 hours battery life.



Mike Alexander
PP-ASEL
Temecula, CA
See my online aerial photo album at
http://flying.4alexanders.com