shutdown

I have a high end alienware desk. 4 large monitors etc.My question is---Should I leave it on 24/7 or should I put it to sleep/hibernate? I have friends advising me both ways, and want to make the best choice.
Thanks
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Ultimate, Service Pack 1, 64 bit
Processor: Intel(R) Core(TM) i7-4820K CPU @ 3.70GHz, Intel64 Family 6 Model 62 Stepping 4
Processor Count: 8
RAM: 32686 Mb
Graphics Card: AMD Radeon R9 200 Series, -1 Mb
Hard Drives: C: Total - 477274 MB, Free - 311105 MB; D: Total - 379417 MB, Free - 378791 MB; E: Total - 574449 MB, Free - 376745 MB; F: Total - 286125 MB, Free - 285904 MB;
Motherboard: Alienware, 0FPV4P
Antivirus: McAfee Anti-Virus and Anti-Spyware, Updated and Enabled