Good luck to you - goals are only of any use if you work towards them, and so you're making a good first step. Better idea is to let it be known to your close offline friends - people that you will actually see if you don't achieve it.
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One being from a 2 year relationship and the other from my current relationship of 6 months.
I thoroughly suspect that you'll find the sex is better with both of these than with a one night stand - you could find yourself missing out on some very good long term opportunities in the pursuit of this aim.
On the other hand, it's easier to break it down to shorter term goals. With this it's a little out of your hands (unless you plan on using your cash to get that number fulfilled), but still it makes sense. How many girls by year end? How many girls by your next birthday? How many girls this weekend? I enjoy high pressure, so I work best this way - if you do not, then ignore me.