The two cabinets I had done for Adam's place were ~500 bucks, custom made, if that helps.

You can purchase your own sink, and just have a contractor install it, as an option.

And no, you're not crazy. I've mentioned more than once that kitchens and bathrooms are the improvements that will increase your home value most. You get the best return on those investments. You still lose some, but not as much as say, re-doing flooring, etc. Adam got just about dollar-for-dollar in appraisal value for the work put in.