GPS Advice: Lowrance 500/1000/2000c

Hello all. I am pretty much set on getting a Lowrance GPS but I'm
trying to make a decision between the three models offered. I'm pretty
much looking at the 1000 or 2000c, but I'm throwing the 500 in the mix
as well because, as far as I can tell, it's another good GPS with a
smaller screen. Money isn't really an object, because I find all the
units to be affordable, but I see no sense in spending more than
necessary. That being said, I'm basically a weekend pilot but I would
like to start flying some longer cross country flights and really would
like a portable GPS. I'm curious if the color screen really adds
anything, especially considering the screen is a bit smaller than the
black and white display on the 1000. I'm also curious if anyone has
found the 1000 or 2000c to be too large. My main x-country aircraft
will be either a 172 or an Archer. Any ideas on other considerations
that I should be taking into account would also be appreciated.

Thanks and Happy Flying!

Brian