Blue Ray can store up to 100 GB, not 50 (4 layers of 25 each, which in real are 27GB in the start).
This topic is as regular as I brush my teeth every night.
PS3 will be the most powerful machine, but its price isn't worth to pay.
XBOX360 price is aceptable, and I would say it's worth a buy, but the game catalog will spoil it as much as it did with first XBOX (unless you're a PC game lover, then, it's your console).
Nintendo Wii has the perfect balance between power and entertainment. It's the weakest of all, but its very "yummy" price, and thinking that it is Nintendo, a good brand, and thinking that you will have good games for it too, it really worths a buy the first one. It is understood that the games catalog won't have any chance against PS3 one, but since Sony prefers to raise the PS3 price, instead of thinking about the user, that's not good for them. I hope they lose this time, and notice that there's no need of "ultra tecnology" to enjoy videogames. If someone thinks that the better graphics the better enjoy, it means that person didn't uinderstand anything about the videogames. Sad, but true.
P.S: I have to say (because there's always a person who say "ohh, you're from Nintendo side, that's why you say so, and bla bla) that I never bought N64, either Game Cube. Instead, I spent all my money on PSx and PS2, and I think these two of Sony are much better than those two of Nintendo (not about graphics, but you all understood me already), but I respect their work and I consider them as a very good videogame company. I really would want Sony and Nintendo working on a videoconsole together. That would be the real future that lot of people want I think. I really would be happy to play Zelda and Wild Arms in the same console.