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105 is the previous generation model. Current model is 106. How many gallons is your tank? I have a 204 (two generations old) on a 20H and love it. I would recommend a 205/206 as it's only $10 more, has a third basket and 40% better flow rate but it depends on your tank size.
I love my fluval 305 and 406...
I would suggest you get one that rated for more than your tank size .. like for my 60g I use a 406-rated for 100g.. and my 305-rated for 60g will be used on a 40g... you can always reduce the flow on the fluvals