I am going to buy GTX 770 GIGABYTE WINDFORCE 2GB
I also have
CPU: i5-3570
M/B: GA-B75M-D2V
Current GPU: GTX 550 ti
OS: Windows 7
RAM: 8GB
Storage: 500GB HDD, 120GB SSD
The fully modular/semi modular thing just makes it easier to unplug everything to clean out the PSU. I do the crazy thing where I blast air in from one side and vacuum the other end however was only an impressive build up after 3 years. However it is probably a good thing to do annually around February, March or April to prepare for summer.