I would go with the sump. While it may be a little more work short term, it would definitely be worth it in the long term. 2 aqua clear 500 filters won't do much in terms of mechanical filtration with the fish you want to keep in there, and nitrates would most likely build up (as they would with canister filters). Drill the tank, hook it up with your 50 gallon and get a big pump to get the water moving. You and your fish will be much happier.
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