Need advice regarding Monochrome/Black & White Laser Printer

Hi.
I'm considering purchasing a Monochrome/Black & White Laser Printer for home printing.
Kindly suggest any model from HP, Epson, Canon, Samsung, Xerox or any other reputable company.
My budget is up to Rs. 7000.
I do a lot of full page black text & picture printing, about 250-300 pages a month.
So the cartridge/toner should be able to run for atleast a month.
Kindly keep in mind the price of new cartridge/toner, and possibility of refillable.
Please base your suggestions on these main points.
Thanks.