I've not had problem with POWER MAN (in win) PSU. note the true rating of the PSU, which is not quite as high as they say it is- which is the NORM for the industry. I've built many workstations and even servers with In-Win cases, no RMAs so far. I can say I've work with 4 Antec PSU/ or cases and had 1 failure.
If its a standard 300watt model, it should handle 2 HD drives, video, nic, audio, 2 optical drives and fd just fine.