Thanks guys. I've talked to a couple of guys who own the 585 and they have the 600w 'ducer and say it has plenty of power. I have 500w RMS on my current sonar, and it's nice, but I'd like a bit more zip. The 1kw 'ducer is something like $400 more than the 600w model, so it's kinda hard to justify, especially when I hear good t hings about the 600w. They're both running the thru-hull 'ducer, which is my plan too.
I'll let you know what I decide...it'll be a mid-summer project at the earliest.
Thanks again,
Bill