Hi sharif, are you a student ? If so you can get many rendering and modelling packages at massive discounts and some may even be free. KeyShot as mentioned by Michael do a student version for less than $100 a year, do a search with your favourite search engine, there are many render engines to choose from these days GPU based ones if you have a powerful graphics card or CPU based if you have a mid to high range processor.

Martin
(TpwUK)