New NVIDIA GTX card in HP TouchSmart 610 Quad series All-In-One desktop

I am SERIOUSLY thinking of buying HP TouchSmart 610 Quad series All-In-One desktop with following (customized) specs. http://www.shopping.hp.com/webapp/s...ore&category=desktops&series_name=610q_series

However, I DO NOT like the graphics card 2GB NVIDIA GeForce GT 425M - looks like they are putting laptop graphics card into a desktop.

My question(s) is/are :

Can I replace this card with one of the NVIDIA GTX series graphics card ? Which one will you recommend? I want to put in a new GTX 590 or any of the following :

GeForce GTX 580
GeForce GTX 570
GeForce GTX 560 Ti
GeForce GTX 560 (new!)
GeForce GTX 550 Ti
GeForce GTX 460

Will it be a simple SWAP or I need to upgrade PSU as well.

If I need to replace PSU what will be specifications of the new PSU? I do not know what is the rating of the current PSU. Do you think, it will handle the new GTX card?

Specs of the desktop :

Operating system SAVE $21 on Genuine Windows 7 Professional 64-bit edit
Processor Intel(R) Core(TM) i7-2600 quad-core processor with Turbo-Boost [up to 3.8GHz, 8MB cache] edit
Memory FREE UPGRADE to 8GB DDR3-1066MHz SODIMM [2 DIMMs] from 6GB edit
Hard drive FREE UPGRADE to 1.5TB 5400 rpm SATA 3Gb/s hard drive from 1TB edit
Office software No additional office software edit
Security software SAVE $30 on Norton Internet Security(TM) 2012 - 15 month edit
Graphics card 2GB NVIDIA GeForce GT 425M edit
Primary optical drive FREE UPGRADE to Blu-Ray writer from Blu-Ray player edit
Networking Premium Wireless-N LAN card and Bluetooth(R ) edit
Productivity ports 6-in-1 memory card reader, 4 total USB (2.0), Beats audio [with I/O for TV Tuner option] edit
TV & entertainment experience TV tuner, ATSC-NTSC with PVR, remote edit
Sound Card Integrated sound edit
Keyboard and Mouse HP wireless keyboard and wireless optical mouse edit
HDMI Game Console HDMI Game Console, HDMI input [for discrete graphics] edit
Your additional options:
Click edit to modify. NOTE: These items are in stock and will ship immediately.
Monitor HP 2711x 27-inch LED Monitor edit

Thanks a LOT.

 

"As I said I would not even think about it." - That is what I thought too. I do not understand why HP is putting such a crappy GPU in a desktop. Any way....that is a different issue all togeher.

Thanks a LOT.

 

I am also looking into custom desktop/laptops from http://www.ibuypower.com/IbpPages/CustConfig.aspx. Thanks any way.