Benjamin Moore. All other paints are inferior.
The neatest thing about the Benny Moore is that it's got different grades you can buy that will give different results.
If you're painting really dark/extremely tinted colors, you want to go with the Aura because it's going to pick up and show the pigment better.
If you're painting a high traffic area (hallway, kid's bedroom, bathroom, kitchen), you can paint with Aquavelvet (I always use Eggshell) and not only will it resist dings/knocks, but it's scrubbable either with water/rag or with a Mr. Clean Magic Eraser. There was a famous incident when I was about three where I decided that we needed some additional wall art and also decided that 'crayola scribbles' was the new designer look, and did most of the upstairs before my mom caught me. It scrubbed right off, no need to repaint or touch up.
Ceilings, low traffic areas like living rooms, and places that will not get splattered can be painted with Super Spec, although I will warn that it's not as easy to apply nor is it as durable in sunlit areas. It's a 3 mil paint as opposed to a 5 mil paint like the aquavelvet is.
Other paints I have tried (sorry Dubi) is Wal-mart, Sherwin Williams, Olympia, and Glidden. All three 'chalked out' in rooms that received a lot of sunlight ... pretty much in order of price/reputation... the Wal-mart chalked out first within six months, Sherwin Williams chalked out in a year, Olympia was a lost cause almost from the beginning, and Glidden was even with the Sherwin-Williams. Haven't tried Behr, but they're supposedly not that bad. I just hate painting rooms, and only want to do it once every five years or so. The Benny Moore outlasts the time period I've ever lived in a house for.
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For trim/cabinets, I *always* use Benjamin Moore Impervo Satin (oil) paint, typically in an off-white color and not a bright white. Oil's easier to work when you're doing trim for three reasons. First, it doesn't dry as fast and it self-levels the brush strokes back out as it hardens over the next month or so. Second, it doesn't ball up as you're dragging it along the trim like latex will... especially when it's hot out. Third, it doesn't give you that 'sticky' effect that latex has when two pieces painted with the same type of paint are stuck together, i.e. a door to it's frame. The caveats are that you need a solvent (mineral spirits) to clean your brush, you need to make sure your brushes are the right kind, and you need to prime a bare wood surface with a latex primer of some sort before you paint with the oil.
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Interior wall paint, I always use Eggshell. (Flat -ONLY- for ceilings, and we paint our ceilings a weird blue-grey color because it seems to true up colors a little better... OC-64 is the benjamin moore color for it.) Trim (oil) always gets Satin; same with wood finishes -- Minwax polyurethane -- you'll be disappointed if you use semi-gloss, much less gloss. Exterior is always low-lustre, but never flat. Flat paint on the outside of a house will chalk out in the extreme sun that we get down here in TX. It will also give mildew/dirt a great anchor to build up on the outside of your house.
[This message has been edited by superspeck (edited 4/26/2011 9:36a).]