the 405 is fantastic.
if you were in palmy you would be welcome to see how effective it is. infact i just bought another one - just incase, and because of the price difference - it was much cheaper than comparable eheims (even when the eheims were half price.. so were the fluvals.. but ive worked with both filters, and the store i work in uses eheim pro's, but i use fluvals cause i can save my self some money and get the same results if not better).
so yeah. if you want a quiet, good, reliable filter that wont bum out on you then go for it. and fluval have a 10 year part retention policy - and most places will simply replace the filter if something does happen to it within warranty.
the 405 i have is running on a 200L 4 ft tank, and soon there will be another 405 on that tank. one with bio media and sponges etc, and the other with water additives like bio chem zorb.. etc. etc....
Edit - PS.. having said that... the eheim (forgetting the model) is on sale for 199 down from 400.. .. hope this helps caper.