GPS selection help

[deshet]

I am looking at buying a GPS unit for the V20.

I want a color unit.

I think I want a built in antenna.

I have been looking a the garmin 172C

and the lowrance LMS-334C.

I want to spend under $500. I like the idea of having a Fishfinder and a GPS unit together.

I just want to know if you guys can recommend any other GPS units.

I also want to know if getting a combo Fishfinder/GPS is a good idea.

I plan on buying the extra chart the add more detail for my area.

I live in VA, and mainly fish the Chesapeake Bay area.

Ebay seems to be the Cheapest place that I have found for the GPS units.


thanks