That's going to depend on where you live because prices in certian counties can be very different because of availability and some countries you not carry all brands. So it may be better if you list what is availablee to you and then we let you know which are better.
If you live in the U.S. then you can get a Western Digital Green for $150.
Ty for the advice , ill buy it in Canada so i think its the same than in the U.S. i would like also you tu comment this thread too please . http://www.tomshardware.com/forum/353768-28-build-budget