I would sincerely suggest Onida for you. Onida is seriously concentrating on their A/C business and the compressors come from Japan from the same plant as Hitachi.
I have Onida in my house and its actually better than my Hitachi in performance, sound, and electricity. I have a Hitachi window the top model with twin fans,
+1 to that. My second A/C which I purchased for my Chennai home recently was a Onida split A/C. No matter how hot the room is, it gets cool in few minutes. The guys who installed the A/C confirmed that the compressor is from Hitachi. It's a lot cheaper than other good brands.
As a side note, I have been using a Hitachi split A/C for the last 6 years again at my home in Chennai and barring the LCD display board which had to be replaced once, it has been running without a flaw. And it runs a lot quieter than the Onida.