Thank you malVizio for the reply.
I use a Corsair 500r case. From what I can tell it has plenty of airflow. It is starting to gather some dust on the front however.
The cards start to downthrottle over 70 degrees? I was unaware of this. I looked around in the NVidia control panel and couldn't find a way to manipulate the fan speeds, but I did watch the fan and temps while playing far cry 3. The GPU Load was ~99%, temps went up to 70-75 degrees, while the fan went from 30% to around 49-50%. Those numbers seemed fine to me, so please correct me if I'm wrong.
My PSU is about 4 years old. Again, I apologize for the lack of a link so I'll just put the name and model here: Xigmatek NRP-MC751. I'm pretty sure, even though it is old, my PSU will handle another card. I may need to buy a higher wattage PSU however, because I do plan on adding another HDD.
As for the motherboard, Duh! I was confused and was thinking the PCI slot was the PCIE. Ooops. I suppose I've been fretting over the air flow for no reason. Don't you love it when your mind plays tricks on you?!
Please let me know about my GPU and temps, and if the PSU should be replaced in your opinion. I don't have too much money to throw at a computer at the moment, so if I don't NEED to replace something I most likely will not.
Thanks for the continued help.