When you are having a big group of people over I try to have a variety of wines on hand to make everyone happy. A selection of reds and whites.
I tend to have a bottle for every 3-4 people with at least 2-3 whites in the fridge ready to go. I always have a few extras on hand in case people want me. A good rule of thumb is to assume people will have at least 2-3 glasses.
My Standards:
Pinot Noir
Cabernet Sauvignon
Zin
Chardonnay
Gewürztraminer
Riseling
Sauvignon Blanc
I tend to pick bottles in the $8-$10 range to keep it affordable but the quality high enough. A few that we have been drinking lately:
Bastille Cabernet Sauvignon
The Immortal Zin
Nimbus Pinot Noir
Eppa Red Sangria
Yellow Tail Big Bold Red
Enza Prosecco
Disclosure: The Eppa, Yellow Tail and Eppa were sent to me but all of our guests enjoyed these with a special not to Eppa for how good of a bottle sangria it was!