i never recommend getting a stuff computer like a refurb dell and then a plan to upgrade it over the long run. at the rate that PC component technology advances, by the time you have done a final upgrade to your computer, you'll have to start all over upgrading the processor, then the GPU, etc. all again because by the time you finish they'll just be old.
since you asked about the parts anyway,
1. god no. the geforce 8000 series is incredibly outdated. it will perform at a mediocre level on low end games.
2. decent memory, but if you're cheap enough that you won't go 8GB, go for two sticks of 2GB for proper dual channel. not sure if it'd make a difference whether single or dual channel but i feel safer with dual channel.
3. meh. it's a 16" monitor, think of a 15.6" laptop screen and imagine if you'd enjoy it as a desktop.
