Andrew, for the money you are talking about I think you're close to the custom rod range which is what I would recommend. All my rods, except for ones I have for certain guests who have no idea what they are doing, are custom made, all with the same wraps, colors, etc.
A good rod builder will work with you and explain the pros and cons of one blank over another. They also load test each blank to make sure the guides are properly placed so that the line never touches the blank, something that is not done with "off the shelf" rods. This is a sure fire way to lose a fish, and for tuna fishing it is even more criticial as you may put tremendous pressure on the rod. I have had rods doubled over with line screaming off the reels, and have never had a blank snap. Also, any problems you may have, you have someone to go speak to about it in person. You may want to speak with Capt Neil here on this board, in addition to making quality rods, he can also recommend good off the shelf rods if that's the way you want to go, but for my money, custom is it, there is nothing like the look and feel of a custom rod, some of them can be real head turners too.
Tight lines,
MakoMatt