Mel – Welcome to the site!
Pixel count does matter for cleaer definition on your GPS screen. The 5000c has a very good pixel count for a color unit. You might also look at the 3300C which will save you about $300. It has the same pixel count. The screen is 5″ diag. instead of 6″, so you get a slightly smaller screen but a higher pixel per square inch count. That should mean a clearer picture for less money. Use the extra money to add a Navionics chart or a ReelBottom mapping chart. The 3300C is due to be released soon.
The other unit I’d suggest anyone take a good look at is the soon-to-be-released Garmin GPSMAP 172C. The 172C has 320 x 320-pixel color screen (4.5″ diagonal). That’s going to be a really nice unit for around $600. It should be released by Garmin in the next month or so.
Here’s the previews on these two color units:
Garmin 172C
Lowrance 3300C
I’m sure we can get a few other guys to offer their favorites here too. Good luck!