The base XPS 8900 is on sale for $799.

http://mailing.enews.pcmag.com/read/archive?id=44927&mid=29167871&e=ANNLEES%40hotmail%2ecom&x=70b93d4e

Very good price but if you want a better graphics card you will have to upgrade the power supply. Although the GTX 960 mini should be okay. Maybe the GTX 950 and regular GTX 960 will work also.