HELP ME CHOOSE!!

• budget < 2.3k
• brand: canon / nikon

HELP ME CHOOSE!! or any suggestion?

Canon PowerShot SX20 IS > RM 1700 > 12.1MP > 2.5" LCD > 20x Zoom > ISO 80-3200 > Shutter 15-1/3200 > Battery 4x AA Nimh > 676g

Canon PowerShot G10 > RM 2068 > 14.7MP > 3" LCD > 5x Zoom > ISO 80-3200 > Shutter 15-1/4000 > Rechargeable Battery Pack > 401g

Canon EOS 500D > RM 2188 > 15.1MP > 3" LCD > 3x Zoom > ISO 100-12800 > Shutter 30-1/4000 > Rechargeable Battery Pack > 526g

Canon EOS 550D (released in 2010) > RM 2488 > 18MP > 3" LCD > 3x Zoom > ISO 100-12800 > Shutter 30-1/4000 > Rechargeable Battery Pack > 736g

Nikon D3100 (released in 2010) > RM 2200 > 14.2MP > 3" LCD > 3x Zoom > ISO 100-12800 > Shutter 30-1/4000 > Rechargeable Battery Pack > 777g