The obvious choice would be wine you personally love to drink!
Remember that a dinner party is about the company – not the food and drink – so don’t worry too much about the exact wine you are providing.
Purchase wine that is not too expensive, and not too “cheap”. You can find some great bottles around $10 – $15 each. Each bottle serves 3 or 4 glasses, depending on the pour.
Depending on the appetizers and dinner food you are serving, choose some reds and whites. A nice white Chardonnay and a good red Cabernet would be a good mix. Read wine reviews to get an idea of the varieties.
Any leftover wine I’ve heard you can freeze into little ice cubes and use at a later time. I’ve never encountered wine left over from a dinner party, so I know nothing about those ice cube ideas, though!