I'm thinking of up dating my GPS. I currently have an SP 2820 which is showing signs of going to GPS heaven and it no longer supported by Garmin. I've pretty well narrowed the field to either the Zumo 590 or the Zumo 390. The 590 has some additional features but for the most part they are not functions that are of major interest to me. The biggest advantage that I can see is the 590's larger screen. Unfortunately those 2.69 sq inches come at a hefty price increase of $300. Not sure it's worth the 50% extra. Just wondering what the opinions of the resident experts might be.