I'd go with what Lizbeth is suggesting, 50 dollars is still kind of steep, but if you have the money and you want it, go for it!
I particularly like Wal-Marts set up because it's an LED hood (I really just like LED's lol), it's rectangular which is nice because it can pretty much sit anywhere and yes you can baffle the filter! But I've also never had it so I can't comment too much on the adjustable heater.
Also here are two tanks that have gotten good reviews around here, especially the second one: http://www.walmart.com/ip/Hawkeye-5-...-Pets/14660258 http://www.walmart.com/ip/Hawkeye-5-...-Pets/17480272
Both a filters that I know you can baffle, all you need is a good heater of which I recommend this one: http://www.drsfostersmith.com/produc...8&pcatid=11368
the 25 Watt one is great and that's the cheapest I've found it online :D
But back to your question, the tank says that it has an internal filter which could be a few didn't things since it doesn't exactly specify what kind of filter it actually is. I have a feeling you might be able to do the sponge baffle, but I'm not entirely sure.