Like the ads says, "Just Do It!"
I'd second CC's suggestions to get the Sunbrella cover, (especially important for those of us that live in the colder regions of the planet!) and the baking/pizza stone.
Get the basket splitter with a second charcoal basket. You will use it more than you think, especially if there are only 2 of you to cook for. Plus, it's crazy efficient for getting screaming hot fires going to sear steaks. The 2nd basket lets you easily swap back and forth between the 2 configurations.
If memory serves correctly, you can also pack about 15 boxes of Dennis' Coconut Charcoal (CocoChar) onto the pallet with your 23" KK. An absolute "MUST!"
Since you're going to have to suffer the consequences of the significant other's slippers, you should load up on all the accessories that you think you'd ever want, so you only have to take the beating once!