hi friend ,Maziar are u asking of me??????
Yes, he is. Generally if you recommend a company, it's a nice idea to recommend some models that they offer as well. Also, IBM no longer makes computers. I believe you meant Lenovo?
For 800, this Asus A52 would do pretty well: http://www.newegg.ca/Product/Product.aspx?Item=N82E16834220699