What PSU will fit into my computer?

[hallat530]

Hi guys, I'm looking to upgrade my best buy computer I purchased a couple years back. http://www.cowboom.com/product/1268254 is a link to the current computer I have. I want to upgrade to an EVGA GTX 970 graphics card and also will need to buy a new PSU. I am uncertain which PSU to buy that will fit this computer correctly? also do you think the new graphics card will fit? Thank you!

update: Ok thanks for the information you guys

 

[Zerk2012]

Thats just a standard ATX power supply, http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013

 

[Karadjgne]

The graphics card will fit, the actual case is long enough. You may have to remove a hdd cage though, which is a very common occurrence in mid towers, and is actually beneficial to cases with front mounted intake fans as it allows for better airflow, resulting in lower temperatures.