I have a 2229 and a 2080 filtering a 125g planted discus tank. The 2229 is an engineering (wet/dry) marvel and although I have noticed that others have had issues with it, it has worked very well for me. It tend to be less quiet than the 2080 and it can drain more CO2 out of the water than you can possibly fill in - which is an issue if you are into plants.
HOWEVER I would go with the 2080; its a later edition and has very high capacity. Its very quiet and very easy to maintain. One issue I have is the mechanical filtration with could be better, but perhaps your FX5 can handle that.