You should get a MacBook or MacBook Pro; it will last you for years if you take care of it, unlike a Windows PC. There are no viruses for Mac OS X and never have been, so you won't need antivirus software; it can't protect you against something that doesn't exist.
The Mac comes with everything you need to get started doing what you want to do, including the iLife suite of programs (http://apple.com/ilife), and you can also purchase the iWork suite for $79 if you need word processing, spreadsheet and presentation programs (http://apple.com/iwork). Mac OS X is the most stable and technologically advanced OS on the market; so good that Microsoft likes to steal ideas and features from it to put into Windows, but without success.
The cheapest MacBook starts at $999; you can get a student discount for your purchase at the online Apple Store for Education (http://store.apple.com/us/browse/home/findyourschool?mco=OTY2ODQzMg) if you can prove you're a currently enrolled student; otherwise you don't get any discount. In that case, you should consider getting a refurbished MacBook from Apple here: http://store.apple.com/us/browse/home/specialdeals/mac?mco=MTY0MjUwOTE
These have the same 1 year warranty as all other Macs, but for less money because they were returned by customers for some reason. Stock changes frequently (daily) so if you see what you want, grab it then, because it will be gone soon.
Don't get caught up in the false promises of specifications between Mac and Windows machines, since they mean nothing in the abstract. Performance has little to do with processor speed, and far more with the efficiency of the operating system, and the efficiency of the code in the applications you're running.
Contrary to claims made by Windows PC fanboys, Apple does not use the same components as crappy PC makers. Apple designs their own systems, including the motherboard, for each Mac model, and they source their components carefully, which is why a Mac has far fewer breakdowns or failures than a Windows PC.
If you go with a Windows PC laptop, you invite and have to deal with more than 150,000 known viruses, with more appearing each day; a PC loaded with adware/crapware/trialware that is of no use to you, low quality components in the hardware, and an operating system riddled with many, many bugs that Microsoft has known about for years, yet done nothing to fix. Do you want to spend your time dealing with all those issues?
Macs retain their resale value far longer than a Windows PC, and Apple has the highest rated support of any computer manufacturer, for the past 3 consecutive years. No PC maker even came close to their ranking.
You can read reviews of the latest models of each here: http://www.macworld.com/products/mac.html