To me, the answer is in the last sentence of your description. Given that the rest of the home is updated, it probably makes sense to update the kitchen. The way you described sounds about perfect -- keep it as inexpensive as possible.
The reasoning behind my answer is that it seems like the majority of buyers at the moment are looking for a home that is in move-in condition. If the kitchen is that much of a downer, then you're not going to attract these types of buyers.
If you would like any other tips, I'd be happy to talk to you, and even visit your home -- no strings or expectations.
Interview 2-3 Realtors with experieince on your area. They will provide a comparative market analysis and provide with you with the info you need to maximize the sales price of youre home. Good luck!... more