Welllllll....

Depends on your ceiling itself!
Is it smooth, popcorn, or other type of texture?

MOST "Ceiling-paints" are a "Dirty White", and are normally VERY flat. Usually flatter than a wall-flat.
>>> Normal CP's can't be cleaned well because they're so flat.

You can certainly use a "sheen" on the ceiling! It's purely "Decorative preference"!
The "Period look" can come into play in some home styles. Fairly glossy ceilings were considered a must in some areas.
Consult experienced Decorators/Architects if this is a concern.

The Brand itself?
Stay with upper grades/best level. Once you're in the top grades, the PERSON & TECHNIQUE applying it is MORE important!
We've got the C2 CP, L8150-01. Really went on nice and looks great. I'm very pleased.

Faron

besides what faron said, here you go

Here is a link that might be useful: ceiling paint

What Chris N said...

Thanks, everyone! The ceiling is just your typical ceiling with a coat of Muralo flat white ceiling paint on it. The paint job isn't the best - a cheap roller was used and the paint was put on too thick. I was planning on sanding where it really needs it only, priming and then one top coat. What would you recommend as a primer? How can I avoid roller marks or marks of any kind? The room is about 20 x 15.

No priming necessary and get a guality brush and cover. I would use a 1/2 in wooster 50-50 cover

christophern, really, no priming? I always buy the best tools - so a 1/2" tapered Wooster brush and what is the 50-50 roller?