New Garmin needed... I like having the Garmin but my question is what are some thoughts on the 590 and 595 Garmin? My 660 which I bought for around $600 (9 years ago) is having problems and needs to be replaced. (tried to have GpsCity fix it but they could not get it to act up and could not diagnose the problem) So...go back to 660 or 665 on a discontinued model (if I can find one) or spend the money on a 590 or 595 which will be $700-$900.?