Actually, most of the Arabians you see winning in halter classes these days are polish or varian lines, or outcrossed with egyptian. My gelding is straight egyptian and he is hot but very handleable. Wherever I go he follows me, and whatever I ask of him, not matter how "scary" it is, he does it. My arab is always in your face wanting to do whatever you do and be loved on. Arabs are very easy to ruin at a young age, and a lot of halter training and showing, and impatience create what most people have met, which is the "flighty, spooky" arab. Their personalities are really designed to bond to one person, and to be treated fairly. My friend gave me a show gelding that had been through many owners, and he was so emotional it was zero fun to ride him. I probably won't buy another Arab that I don't raise or that comes directly from a very reputable breeder, but Arabs are by FAR my favorite breed of horse, I don't think I would own any other breed.
In general, the straight egyptian arabian is small, compact, short legs, short back, medium length of neck, flag tail carriage, and short dishy face, dense boned.
This is a straight egyptian Arabian. http://www.jaballaarabians.com/AlFahiir.html
A polish arab is large bodied, long back, long legged, long necked, lower tail carriage (usually), longer less exotic face.
The Million Heir, pure polish stallion.. who has a GREAT performance build with hocks you'd want on any horse. http://www.extendinc.com/alioto-reiss/millheir.htm