Hey, I just ordered a radeon 5770.
And noticed that there are many different
'Radeon HD 5770'
http://m.tigerdirect.com/m/http/www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=6078145&CatId=3669
on tiger direct you see they have like..
Visiontek, Asus, Sapphire, MSI, and XFX
it seems they are all pretty much the same. But the price tag is different
and so is the look of the graphics card. But they are both 'radeon 5770'
could someone please explain? In much detail.
I've also heard of a 'powercolor 5770?'

Those are the names of the manufacturer of the cards. Radeon (and Nvidia also) are produced by external manufactures like Sapphire, Gainward et.
The difference depends on the card and the manufacturer. For example:
Radeon 5770 by MSI - has go the Core Clock speed at 850 MHz and the Memory Clock at 4800 MHz
Radeon 5770 by XFX - has go the Core Clock speed at 875 MHz and the Memory Clock at 5200 MHz

So the XFX one is faster and probably has better cooling. They have some other differences like different Connectors.

My 9600GT has Asus mark on it...I think MSI version should be more stable and less power consuming.