i also have purchased the hb 597c hd di from this site:
http://www.anchorexpress.com/Color-L...nders-s/99.htm it was the cheapest that i could find on the internet under $600. it also has the one that matt bought, but not as good of a price that he got, but close.
if you look at the cabela's site, look in the bargain section. it may still be there. or try the search feature it may come up.
if you don't want to spend or need these options then i would suggest the lowrance m68c. it is nice and adequate for fishing needs. i started off with the x67c model last year (if i had known about the m68c i would have gotten that one,) but decided that i needed something more or was it just size envy????