What your seeing is the effect on cheaper LCD screens.
Don't quote me on this, but I believe the "color shift" effect is more evident on TN panels.
IPS panels are typically more expensive, but don't suffer from that effect.
Further, some panels can be rotated to better effect that others, though typically IPS panels will look much better rotated than TN panels.
Do some searching around these boards for LCD, etc, and you'll turn up lots of recommendations.