I need some advice on knives!

So we've been married for 4 years have have this ancient crappy knife block with horrible knives. We've decided to finally upgrade! I need your suggestions on brand/type of knives to get.

We don't need to get a whole set, in fact, I'd rather spend $$$ on ONE really good knife I will use all the time (and just buy a cover for it and keep it in a drawer)

So give me your suggestions!