ASUS Essentio CM6730-US-2AA Desktop PC Intel Core i3 2120(3.30GHz) 4GB DDR3 1.5TB HDD Capacity Intel HD Graphics Windows 7 Home Premium 64-Bit
$499.99 and free shipping
http://www.newegg.com/Product/Product.aspx?Item=N82E16883220107
Hannspree By HannsG SL231DPB Glossy Black 23" 5ms Full HD LED BackLight LCD Monitor w/Speakers 250 cd/m2 1000:1 (Typical), VESA Compatible
$149.99 and free shipping
http://www.newegg.com/Product/Product.aspx?Item=N82E16824262012
I don't know what your budget might be but you could get this prebuilt for $550 and it would be good for what you want it for. Unless you want to build a Pc , then you could give a budget amount to work with and if you need everything including a monitor , mouse , keyboard , speakers.