Engineering laptop

Hey guys, I know there are alot of these threads lately that I have read over, but I am kind of getting lost in all of them, so I would appreciate it if you could give me some recommendations for a laptop. I am looking for one that is $1000 or under, and has at least these specifications <http://www.mae.ufl.edu/mae-undergrad/Computer_Required/computer_required.html> . If there is not a decent one that can be bought for these specifications for under $1000, please let me know of the next cheapest ones. Thanks guys and I look forward to the responses.

Well these days laptop markets are shooing guns in the air.. I just want to shift my computer system to laptops. I am in a dilemma whether which laptop is the best one to purchase on? can any one suggest me eith the same?
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Used Apple Mac Laptops