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I agree with QTOFFER. The Stealth is a great product. Big Al's is about $6 cheaper and they have the free shipping as QTOFFER pointed out. Plus, you will earn bonus points that can be used towards discounts in the future.
If you're running a canister filter though, you might wanna look at the Hydor ETH in-line heaters. I have just one ETH 300 (300watt) on my 75, and it keeps it a very stable temp. My tank IS on an inside wall of the house, and not in a huge drafty area, so that probably factors in a little...but the ETH isn't running non-stop so the 300 is pretty much fine on 75gal setups.
i have the 250 Visitherm stealth in my 55 gallon with a 10 gall sump. It keeps the temp stable unless my apt. gets Very cold (55 or below). Get it from big Als.