also pick up a dell biz pc http://www.dell.com/us/soho/p/optiplex-3010/fshttp://www.newegg.com/Product/Product.aspx?Item=N82E16814500276
or you can pick up a home dell or hp and the 19.00 video card and put in 4g of extra ram so that you have 8g of system ram.
most new pre builts amd and intel have onboard gpu that run one to to monitors. the nvidia or ati card will run the other two.
i would also pick up a small nas backup for your house. one that holds one to 4 drives. and use some good small biz backup software. or sign up if you have high speed internet a cloud based backup.