I hate to break it to ya but could you inflate your budget a little. A FURUNO FCV587 or 627 would do the job nicely for Bluenose or Grouper but you would need a 1 kw transducer as well. A client of ours is using one off Kaikoura and fishing for Ling at 500m with electric real. When I asked how long it takes to wind up the answer was "2 Stubbies"
There are other brands but all would need a 1kw transducer to show fish reliably at 200-500m
(Below links are for example but I will disclose I do work for the local FURUNO distributor)
Furuno FCV627
or this
Furuno FCV587
with one of these
Search results for: 'tm258'
Unfortunately I sold the spare FCV585 to another forum member, it would have been perfect.
(Munsey you got a hell of a deal didn't you!!)
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