Maybe off topic: Is it better to go with private or shared proxies? Why?
That is a pertinent question. Let me try to explain.
The choice between private and shared proxies primarily depend on how many you need, how soon do you expect them to be blocked and what you intent to user them for.
The trade offs are pretty much what you can think of - speed, others spamming, whether you need heavy traffic or not.
Other things I can think of is the restrictions that proxy sellers put on shared IPs. Many sellers, including me wont change shared proxies once they start to work.
In my opinion the most important thing is who you share the proxies with. Say for example you shared the proxies with 5 people, all trying to use them on, say, a game server, it would be a huge turn down. No one will be able to do what they intended to. But if the usage was filtered then, given the rest of the things, they will be as good as private proxies (speed is a consideration). You would not be surprised to know that most providers dont filter usage. They wont even care to ask what you use the proxies for. No way anyone can filter usage without even asking. And I doubt anyone would get down to checking millions of lines to benefit customers. I get a lot of eyebrows when I ask - what will you use the proxies for? I hope now they would know why I ask. With shared proxies it is primarily your luck - if you chance upon a good group you are lucky, if not you are unlucky (this does not apply to me, since I do filter usage).
So a host of considerations for you to account for, and not many are under your control.
Another word of caution, while most private proxies are sold on the claim that they are truly private but not many are. I have had many users, coming to me just because they found someone else using their "truly private proxies".
If you need anymore details or help to decide whether you need private or shared, feel free to tell me what you will use the proxies for. And when you actually disclose the usage think in terms of who is the blocking authority. You may post on the thread or send a PM or any other way you prefer.
All the best for your proxy search!!!