Noob tip for you:
Build several small TGPs snd make experiments with them before starting the big one. Learn how to trade and how to manage traffic between your sites.
It's not about how much cash you have and how much you want to pay for a given service. It's all about how you will continue to manage traffic on your site(s) once the feeder traffic is gone.
I have seen lots of newbs buying some feeder traffic and get their sites to 100k per day and then see them go back to ground when feeder has stopped.
Want to get a 99% stable 50k site??? Buy 1 million uniques per day during 6 months (this makes a total of 175 million uniques). Then stop the feeder and I suppose that you will have at least 50k bookmarkers visiting you every day
A cheaper way to build a 50k TGP is to build 20 sites with 5k each one and then feed the 50k site with them. This will give you instant 15k to 25k almost constant feeder... all the rest is up to you. Of course this solution requires some work and time.
If you do not have $$$ for the 1 million uniques per day, or you have not enough time to grow your site, or you still don't want to work your ass and do not want to learn how to grow a TGP, then you can hire someone to do it for you. I seems that Mr DamageX is good making TGPs grow, but his services are not cheap.
So, in conclusion, you can do it yourself and only pay $200 for the 20 domains + some hosting and learn while growing your site, or go to some faster solution and spend any given quantity between $500 and $175.000 (assuming you buy the 1 million uniques per day a $1 per k)