Wow limited to 5 huh?
1. Good Japanese vegetable cleaver (more agile than a chef's knife)
2. Stand mixer - who doesn't go with kitchen aid?
3. microplane grater. they rock
4. Cast iron skillets are the best
5. Bunn BH-10 coffee maker - like commercial but for the home.

As for a good coffee grinder that is actually pretty cheap look at the kitchen aid ProLine series burr coffee mill. it is about $200 but well worth it.