thats not really an ideal solution tbh. surely you want to be spending your money on a well built, reliable, easy to use and all round decent piece of kit. buying the biggest might not be the best overall.Forget all the rena vs fluval vs ehiem rubbish.
Just buy the biggest filter you can afford.
Simples
lots of people have been purchasing the all pond solutions (aps) filters that according to the website have a huge flow rate but the filters are very cheap to buy. i would love to hear from these people in a year or 2 to see how the filters are bearing up. peersonally i wouldnt touch them with a barge pole but i understand that the price is very tempting. i think they even have a built in UV so for about £80 (maybe less) you get a huge flow rate, UV steriliser but a badly built and fragile filter.... they are based on the tetratec design looking at them but just too weak and delicate.
dont forget the filter is the heart of your tank. if it fails then you are in trouble. a filter is just that a filter so dont get carried away with built in UV, electronic flow rates etc etc etc as they are all just something else to replace in time or go wrong. dont get caught up in the electronic gadget thing.....
if you want the biggest filter you can buy for the money get an FX5 but on a tank of this size it will blast your fish against the side of the tank.... so again not the best advice really to get the biggest you can get....