A custom loop will always outperform a closed loop. It really just depends on what you want to spend. If i was broke I would get a closed loop or a high end air cooler or if I had the money to spend I would set up a custom loop. This the site I put my cooling together from. http://www.swiftech.com/
except the gpu block and black ice radiator I got from frozen cpu. You could use my exact setup and it would work fine.
Swiftech MCR-X20 240mm rad+Black Ice xtreme II 240mm rad, swiftech MCP35X pump,Apogee HD cpu block with helix120 fans