thanks wawa for the details.
i was hoping i would be able to use the 127s 
i checked on stores and couldnt find 120s but i did find 122s, i havnt checked the datasheets for 120s and 122s yet ( as it is i dont i will be able to make out much from the datasheets coz i am still learning ), but i hope i can use the 122s instead ?
also it would be nice if you can suggest a good mosfet i can try to search for it as well