cs4 VS. cs4 extended VS. cs4 master collection...

i dont understand the difference! i think the master collection is a group of other programs such as lightroom and bridge, on top of photoshop CS4.

which should i get if i will ONLY be using Photoshop CS4?

all help is much appreciated as i am very confused! thanks in advance!

Extended refers to Photoshop only and adds support for loading of 3D models as layers in the image and allows you to rotate and move them around; not really useful for Photography.

CS4 Master Collection is a compilation of ALL adobe products and unless you need the video, illustration, page layout etc applications then it's a lot of money to spend for a lot of apps you wont use.

If all you want is Photoshop then just buy "Photoshop CS4" (Pretty sure bridge is supplied with photoshop).

Master Collection doesn't include LightRoom by the way...
As for PSCS4 vs. Extended: Link

cool, thanks so much!