Picking a primer
 

In my dining room, I have some areas of new drywall, freshly hung. I also have existing walls with paint on them already. I want to prime everything (obviously the new drywall needs primer) so that I will get a good, consistent finish when I get paint over everything. What type of primer should I use?

Zinsser Bullseye 123 is about the best you can get in a latex primer. Benjamine Moore Freshstart is also good.

If attic above and if you need a vapor retarder, use oil base paint. It stops moisture to your attic almost 3 times better than latex. Or use a special vapor barrier paint ---- almost 13 times better than latex for stopping moisture.
Be safe, Gary

I would use SW Pro Block. Its a premium primer. A low voc stain blocking, adhesion primer that's great for new drywall or previously painted walls. It will give your top coat a consistent finish and it also dries fast. I would top coat with a premium 100% acrylic, SW Superpaint or Duration.