This is my first build. I want to be able to run most games well. I'm trying to keep it around $800. I'm not sure if the psu I have listed is what I need. Any help on that would be appreciated. Also, is the hdd worth it and should I bump the ram to 8gb or is 4 enough? Thanks!
The 20+4 will work on a 24pin. There used to be/are some motherboards with a 20pin motherboard power socket.
I'd recommend a Samsung F3 1TB hard drive, as they are the fastest SATA II drives and are reasonably priced.
I agree on the Antec 300 case recommendation, and also suggest the Cooler Master 912 as an option to consider. I had the 300 and loved it. Cable management in mid towers is awful, but the 300's airflow is probably the best among mid towers.