That is Gabowman's boat, I'm thinking it is a 690 Ranger, would be a great boat for you if you can find a used one in your price range. There are a lot of boats that you can set up for longlining. About all bass boats can be used. I have an old tri-hull I rebuilt for longlining. It works very well.

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Can't seem to find any pics I took while fishing to show the set up. For the money you plan to spend you should be able to find a nice boat but be sure to save enough money for buying everything you will need like rod-holders trolling motor with I-pilot deth finder.