you mean the HarDDrive(HDD) not memory, or i hope you dont.
If 150gb is now the standard memory amount i really have to update (memory is ram, video memory is your graphics cards ram).
and i must say, why a laptop?
unless your making big trips id really advise a computer instead.
And you are asking for much, i agree with what i think OBese87 is trying to say...
A laptop, with what your saying, and i bet you want it to last, i doubt one exists. (that or he misspelt troll for trick).
I also can assure you, you will go over 50GB if you want to play the games you mentioned...
Smoke me a kipper, ill be back for breakfast.