Y0GI :
The Evo is excellent but it is only 120 GB, not 128. The 840 Pro has 128 GB. Both are highly recommended/reviewed.
Yogi
thank you

You're right it's only 120gb.I think I wil go with 840 evo 120 gb it is more cheaper than 840 pro.
But in confront with ssd disk like kingston , or crucial witch do you recommend ? Do you think samsung is better ? surely has a nice read and write speed..