One has an 3rd gen i5 with a GTX 660 and the other one has a 2nd gen i7 with a GT 545. I don't really know the difference so I would also like to know why it's better than the other. (If theres a better desktop with prices around 1000 please tell,it also has to be in best buy.)
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Hi. The i5 with the GTX 660 is the best of the two and all desktop less than $1000 at Best Buy if you must buy one from them.
Edit: It's funny and sad that the next best GPU is a GTX 650 and a lot of GT 630 and GT 620. If you're willing to build one, you can get a much better desktop for that budget.
With your budget you could build a computer that can max games for a while and a few years down the road still play games on high settings.
This alienware will only get you high settings within a year and won't be very upgradeable.
It's not very hard if you're willing to try. Everyone has to start somewhere right? But you are entitled to make your own decision and we're just here to help. Here's a building guide with videos just so you get some idea of how it's done even if you're going to buy a PC. Who knows it might come in handy someday: http://techreport.com/review/23624/how-to-build-a-pc-the-tech-report-guide
Ok, I'll try to look into it and learn some things. If it really is easy then maybe I'll build it if not then I'll stick with pre-builds. Thank you for all your help and recommendations.
You're welcome and remember that we're here to help if you need it.