Hello WalnutNid,
These Xeons seems to be rather slow due to low CPU frequency.
As for the graphic cards, we usually recommend high-end gamers cards.
nVidia GeForce: GTX 580, GTX 680, GTX 780, GTX TITAN, GTX 980,
AMD: Radeon HD7970, R9 290x.
Some of them are far above 150 dollar limit, but possibly you can get used card from the recommended for this price.
You can check the number of shader processors for recommendedd nVidia cards and compare with the number of the cards you are looking at (comparison between nVidia and AMD will not work).