Dell Inspiron 620 MT PSU Upgrade or Compatible GPU

Intel Core i5-2310 2.9GHz Quad-Core Processor
6MB Cache
8GB DDR3 1600MHz Memory
1TB 7200RPM SATA Hard Drive
Intel HD Graphics 2000
DVD±R/RW Optical Drive
Integrated 5.1 High Definition Audio
Dell 802.11b/g/n Wireless LAN
10/100/1000 Gigabit Ethernet
8-in-1 Media Card Reader
Ports: 8 x USB 2.0 (2 front, 6 back), Headphone, Microphone, RJ-45 (Gigabit Ethernet), VGA, HDMI
Expansion slots: 1 PCI Express x16, 3 PCI Express x1
Windows 7 Ultimate 64 bit

I have these things hooked up to my computer at all times:
22' samsung LED widescreens x2 (dual monitor set up)
Wacom Intuos 4 Medium
Logitech m505 universal wireless mouse and keyboard
Wifi Kodak esp office 2170

In spite of all of this I was wondering if my computer could handle the HD 6670 Gddr5 card. Thanks. I'm not much of a heavy gamer but I would like to play games like Batman Arkam City or Lego Batman. I design a lot if it matters. Just worried if my system could take the HD 6700 without causing damage in the long run or short run.

According to this:
http://www.dell.com/content/products/productdetails.aspx/inspiron-620?c=us&cs=19&l=en&s=corp&~lt=popup
^It can take it, but I just want to make sure.

Is there any other lower recommendation cards that would be on the safer side? Or is the HD 6670 safe?