eggshell

Matte finish will make imperfections less obvious.

Eggshell is typical it's what most people run with, Satin will most likely be too bright and show off all of your handywork... flat will hide your imperfections the best... however durability is not there with the flat... if the paint you are looking at has a sheen between flat and eggshell this may perhaps be the winner, I know Ben Moore has a matte finish that looks great after cure... gives the durability of eggshell without the sheen.

Matte is marketed as being as durable as eggshell but I still haven't really found one that really is that durable. Aura Matte is probably the best one out there, but really if you want true durability, you need to use an eggshell. Yes, it's shiny, but that is the tradeoff.

It's all relative too....

My FPE Eurolux "Matte" looks like a standard EGGSHELL!
My C2 "Matte" is much closer to a "Flat"...just the slightest sheen.

Use Eggshell!
Very washable....WHEN FULLY CURED....

Faron

http://fortheloveofahouse.blogspot.com/p/paint-colors.html

this is one of the best blogs I have seen for information.
She gives colors and sheens for every room and they are magnificent.