Okay, your budget is enough.
You can get an i5 2nd gen PC with 500gb hdd and 8gb ram DDR3. About GPU, if your budget stands at 12000 or around go for 750ti if its around 15000-18000 just get gather some more amount and go for 1050ti(used).
I don't know if I am wrong but you will get 150+ fps in CSGO.