You could also consider a fish of the day as well this is usually sold for a sale price which means you could ultimately service 4 or more people and not break the bank! As for the theme of the party it's really important that you "dress" up your table, this is going to make an immense difference! Try different tabletop accessories. This could be anything from beverage dispensers and some really stylish dinnerware to something really simple like a bouquet of flowers or napkin rings.
For example, when you offer your guests a drink, it doesn’t have to be in a plastic bottle. Try and spice up things with a cool glass beverage dispenser:
The point here is to not overdo it, but to make a stylish presentation of your table. The table is going to not only be a focal point for your dinner, but also a conversation piece as well which could even bring up some really nice conversation too! You don't have to work hard when it comes to hosting or cooking a dinner party - simple little additions to the food and the table could really end up wowing your guests!