11-02-2009, 08:24 PM
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Molliefan, getting another Whisper20i would be a great choice as well - those are very reputable filters, and work great. In my opinion, if one filter works well for you, and you are used to it, I would definitely suggest to get another one of the same if you are getting a second filter. That way you can use the same technique and are familiar with the functionality of the filter and doing maintenance on it.
If you get an Emperor, or Penguin, or even an AquaClear, you are going to have to become familiar with a new piece of equipment, and they all require a different way of maintaining it, and utilizing different media. This may bring about some negative aspects, unless you are willing to learn and want to be exposed to new types of filtration.
Down the road you may want to try something new, like a bio-wheel, or a Sponge filter. And you may end up getting a bigger tank, which may put you on the path to a canister filter. You have to make the decision too if you want to try something new, or if you'd rather stay in your comfort zone.
All of the filters mentioned here in this thread by other members are the best of the best. You cannot go wrong with any of them.