For $650 the AirMap 2000C was my choice and have been quite pleased with it.

It has a large 5 inch, 256-color diagonal display with a resolution of 320x240. It has terrain awareness that can also display a profile view of upcoming terrain and an ETA to that point. It included MapCreate mapping software that allowed me include additional "local landmarks, etc." via the MMC/SD card reader/writer that comes with it. Plus all the gear I needed to install it - like the remote amplifying antenna, cigarette power adapter, yoke mount and suction-cup mount bracket. Additional features included a customizable HSI screen that can be displayed from a menu of over 20 options.

I have never used a Garmin, but the combination of the price and features of the Lowrance 2000C made it a cost effective choice . . . and I have not been disappointed.