Having authority sites is key -- it's my strategy now. However, I don't recommend you go for credit cards, especially if you are new to this game. You certainly can make a sucessful credit card site, but you have a long uphill battle and you won't see money for a long while.
The reason is that ultra competative niches have a huge penalty for ranking, especially when it comes to high CPC niches. If you have site in the niche that has already been around for a few years and has googles trust, then you certainly can make inroads faster -- but don't make a brand new site about CC's and think you'll see money in a couple weeks or months (short of getting some powerful high
PR/trustrank backlinks). If you don't mind at cracking away at the niche for a year or two and slowey build it up, then go for it.
Niches with far less competition are easier to get traffic and money -- you can make money much faster. You can go after competative terms, certainly -- but you better have a long term focus, because it can be disheartening making nothing for a long time before seeing something.
my .02
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