kdl-40x4500 oder kdl-40z4500

Sorry for posting this in english! I can read german, so do reply in german but it's too difficult for me to write :^]

I'm about to replace my age old CRT with a shiny new LCD.

My typical usage pattern is:
1) movies & series from DVD (either from a Playstation 2 or from a PC or Mac laptop)
2) analog SD tv over cable

Not yet, but potentially soon:
3) digital cable, possibly HD
4) Playstation 3

Since I can get a nice discount on Sony equipment, I'm currently looking at either a KDL-40x4500 or a KDL-40z4500. They have exactly the same price and the features are only slightly different:

- bravia engine 2 pro (x4500) vs bravia engine 2 (z4500)
- motionflow 100 hz (x4500) vs motion flow 200 hz (z4500)
- 12 Watt audio (x4500) vs 10 Watt (z4500)
- 4 HDMI inputs (x4500) vs 3 (z4500)

The main tradeoff seems to be the bravia engine 2 pro vs 200hz motion flow.

Any suggestions on which of these two sets would be the best buy?

Thanks in advance for your opinion.