Thanks for the concern guys but the situation is different. I have an Antec SmartPower 400W psu. I think this is all I will ever need, even when I add my water cooling setup. I have listed my computer stuff below for you guys to judge. I'm just asking because I might get the enermax 550 for around $70 and am wondering whether to sell or keep because it is such a good deal.
CPU: AMD Athlon64 1800MHz
Motherboard: Asus K8V
Memory: 512 MB of Corsair PC3200
Video Card: ATI 9800 PRO ATI Radeon
Hard Drive: WD Raptor WD360GD 37.0 GB @ 10000 RPMS
Additional Hard Drives: WD Speical Edition WD800JB, 80GB, 7200RPM
Monitor: Samsung SyncMaster 170N
DVD Manufacturer & Model: Samsung SD-616EEPB
DVD R/W: Lite-On SOHW-812S
Storage Interface: IDE,SATA
Sound Card: onboard
Speakers: Creative(crappy)
Internet Connection: Comcast Cable
Operating System: Windows XP
Other Components: Cooler Master Wavemaster case
Antec SL400 400W