I'm looking for a good-quality in-dash GPS Navigation system compatible with a 2007 Honda Civic LX?

I was looking at both the Pioneer AVIC-D3 (or Z2 with the backup camera) or the Magellan Maestro 4250. Any other suggestions that can fit into a car like mine (or a Scion tC for that matter) that has a double-deck audio system or the like?