Driving Quick Traffic to a Social Network Site - Any Ideas?

One of the bigger projects I have been working on this year is a social network with a couple of old school friends/business partners (I know, it's a risky combination). We have outsourced most of the website creation to a local web development team and we have pretty much finished what we are calling the "first phase of development".

We have invited friends and family members to check out the site and help give us some feedback about how it is working. Unfortunately, there are two problems with this:

1) They are our friends and family, and not necessarily our target audience (i.e. some of them have very little interest in the niche we are working in).

2) Being our friends and family, they have annoying habit of being either overly positive or overly negative. Whatever they say, it is difficult to know whether it is good feedback on the functionality of the website.

We have decided what we need is about 1,000 strangers to hit the site in the short-term. If no one uses the site, we can take that as a hint that we have not built an interesting enough platform. If they use it/leave feedback, it will probably be more helpful feedback than that of our family and friends.

Watching how people use the site, and reading what they will say will give us a much clearer idea of whether we are heading in the right direction.

The social network itself is in a sport-related niche. We have got a smallish budget to get some fast traffic to the site to assess people's reactions. We have setup a bunch of fake users, and we are posting content regularly to make the site look "busy".

I would like to know if any Warriors can offer any suggestions for paid traffic sources to quickly get 1,000 visitors to the site? Here are my first thoughts:

Paid traffic from:
Stumbleupon and Reddit
Possibly CPV?
Facebook ads?

Does anyone else have any other suggestions/insights?

I would be ridiculously grateful for any help anyone could offer.