I don't really have a "house wine." As wine is one of my hobbies, I
love to try new things, and to try match food & wine.
It's very rare I buy anything in case quantities except for wines that
I expect to have a long cellar life, where I'll drink the case over
10-25 years.

That being said, there are a few favorite cheapies that are pretty much
always available in cellar. Ones that Betsy knows are fine for cooking,
that we like to drink, and that are great for big parties:
Red:
Iche "Les Heretiques"
Borsao
Cline CA Zin
Three Thieves Zin

White:
Pepiere Muscadet
Castelvero Cortese
Brocard "Kimmeridgien"
Drouhin Macon
Brun Beaujolais Blanc