I've never heard of it. That is most likely a no-name brand. 280w is cutting it close to begin with and if it's a low quality unit it probably isn't supplying 280w of power anyway. Take a look at the
Power Supply Reference Guide and the
Power Supply FAQ.
I would recommend trying a new power supply before you go building a new system that you don't need. Here are some good units that would work well:
Thermaltake 420w
Fortron Source 400w
Sparkle 400w
Any of those would work. Personally I would go with the Thermaltake 420w because it is the cheapest and is also a rebadged Enlight which is very good. Your current configuration could easily be powered by a good quality 350w PSU but with the 400w+ units costing little more it makes sense to get a higher power unit to allow for upgrades.