I recently bought 10,000 targeted hits at ihitz.net. They claimed to offer 10000 targeted hits in the US. I put a tracker on my site, every hit I got from them was from a different country. Buyer Beware!
Buying bulk traffic is almost impossible to work out anymore. Most are from popunders or from multiframed sources. I bought 200K from a handful of services, and most I traced back to proxies and multiframed, although they claimedtobe targeted.
Use Adwords for getting good traffic.
-Allan