Well, I saved up again and happened upon a lightly used 597 HD di gps combo for just over 300. Think I'll try it out and see if I like it. If I don't, I should be able to recoup my cost pretty easily at that price.

. I have gotten used to the monochrome 581 screen after using it a bit more. I may keep the 581 and put it on my dad's old boat since he is running an old tcr id1. I can also swap heads that way.