It's foolish to spend this much money without a proven kitchen designer. Most carpenters will install whatever you want, no matter how poorly designed.

So a design/build firm?

Why not post your kitchen design here to get the best possible plan?

Or a kitchen dealership. It depends on the kitchen dealers that are in your area and how they are set up. Also depends on the amount of service you want or need. You could hire kitchen dealer for design, cabinets, countertops, hardware...misc materials. Then hire them to install (if they offer installation) or, hire your own general contractor. Or skip that and hire a Design/build firm. DB is usually the most expensive route, but you get what you pay for. DB will have more hand holding and service along the way.