The PS3 in my opinion has been the leading console for some time now. Its only downfall was the price. However, now the old 'fatter' versions have been replaced, there is no reason not to buy one if you are looking to invest in a console.
You get the 320GB HDD, Blu-ray capabilities, Six-axis controllers, a range of some amazing games (titles such as Uncharted 2: Among Thieves and Metal Gear Solid) and not to mention Playstation Move...
The console itself is much faster, quiter and cooler giving an all round better gaming/viewing experience and Playstation Move is a great addition.
The only downfall for me is the noise of the disk drive when a game is loading, however this soon stops and shouldn't put you off.
The PS3 offers many different 'extras' so to speak. Things such as the Playstation Eye and PlayTV make the console even more impressive. I have used both a PS3 and an Xbox and personally prefer the PS3.
So if you are looking to buy a games console, i would highly recommend buying a Playstation 3!