I have been looking for a good power supply that has a good price on it.
I was looking at a 500 watt power supply but was told that i should get a bigger one in case of upgrading, i have taken their advice and looked for a stronger PSU.
Here is the one i am looking at and the one i upgraded from
As for the case I'd go with an NZXT (owning a white NZXT H2 myself) or Fractal Design Define R3. Given you want a medium sized case. Both cases are available in white and black, and the Fractal case in even more variations (like titanium grey). Both cases are around 100$ (at newegg), but are worth every cent.
I'd go with an Enermax 82+ or 87+ as a power supply, both are also available as a modular cable management variation (Modu) or with fixed cables (Pro). Stable, efficient and very silent.