Sounds pretty good, but I usually hit the Action Zone first because it has more of the low-capacity rides. Face/Off and Drop Zone are two of the slowest rides at PKI; however, Flight of Fear is slow also. The Vortex was finally running its third train again today (5/13), so its capacity is very high again.
The way you are thinking would probably take you about five hours, depending on how busy the park is that day. With the order you are planning, you are going to be walking back and forth from one side of the park to the other all day long. I would suggest starting at Face/Off in the Action Zone, and from there you can ride just about everything in one big loop around the park, with no back-tracking. I would suggest the following order:
1)Face/Off
2)Drop Zone
3)Top Gun
4)Son Of Beast
5)King Cobra
6)Adventure Express
7)Racer (lines are usually pretty short
8)Flight Of Fear
9)Vortex
10)The Beast
11)White Water Canyon
By doing this you will walk in one big circle and can hit anything in the park easily. Also, if you see anything else that you would like to ride in between rides, you can hit them as well. Doing it this way, I can usually hit everything before lunch (except on very busy days).