∙ Most GPS receivers(antenna) come packaged with software and drivers (your milage may vary).
∙ A number of folks like to mix/match because their favorite software doesn't come w/ thier preferred antenna or vice versa.
∙ Most software comes w/a variety of maps (check to make sure your area is covered).
∙ Checkout GPSPassions, they've a great selection of reviews on both antenna and software. AND a great source of info regarding GPS knowledge.