Had a feeling
Although not sure what the clearance will be with the case, as the case is 205mm wide and cooler is 153mm tall, accounting for the mobo standoffs and what not i think it'd be a tight squeeze. Be best to clarify whether it will cause a problem or not.
The ram would allow more bandwidth if you ran out of 1:1 ratio with the cpu, it allows for a better overclock than 800MHz would again, bit of personal preference as to whether you would benefit from spending a bit more.
As for the drive issue not too sure as they should work perfectly fine together, what do you mean by wouldn't load?