What PC out of these?

the one with the i5 mate, enough said!

8gb of RAM is overkill

I am using the onboard graphics for my Fm13 at the moment as my GPU is acting up a bit and it is working well..

you can always buy a cheap GPU DDR5 1gb 256 bit Nvidia card and it will look great!
Out of them the i5 as Raikan said. Although for that money I'm sure you could build your own computer that'll be much, much better.