iPhone 4S over iPhone 4: Should I stay or should I go?

Reasons to buy iPhone 4S:

• Dual-core processor and 7x more powerful Graphic
• Siri natural language commands and dictation engine
• 8MP camera with improved low-light performance and capture speed
• 1080p video capture with stabilization
• GSM/CDMA dual-mode device
• Dual Antenna
• 16GB,32GB,64GB
• Bluetooth 4.0

Reasons to stay with iPhone 4:

• Same design
• Same Retina Display screen & same size
• The amount of RAM doesn't improve
• Siri doesn't work too well for people outside the US
• You'll manage to snap more photos and longer videos and avoid 1080p playback problems