I don't really know much about computers so can't really say if this is a fantastic deal or not but the listed (probably inflated) price says its 42% off.
The AMD processor and NVIDIA graphics card seem to be good and go for about $1K in total on the AMD and NVIDIA websites. They haven't mentioned which power supply & heat sinks they use but those usually go for about $150 & $50 max. I guess you're paying another $750 for the Lenovo box.
Very poor value.