What do you think if it's good to use ready-made dedi or order it from the company. Both services are available from HqHost.net but I don't know which one is better. What would you do?

What services are you talking about? You have ready made server and would like to colocate that or you want to get certain server from the same collocation company?

Sounds like a normal package they offer vs a custom package? Guess it would depend on what your needs are and if their normal package meets those requirements or not.

Are you suggesting that you want to build the server itself, to order, rather than just talking about the hosting packages available? If that is the case, I cannot see a huge amount of purpose or reason for it-I think that in the majority of cases what is available will suffice just perfectly.

I think you may use a ready-made dedi if it suits your needs well. I guess if you order any other, it'll be pricy. I saw that ServerPoint.com, A2hosting.com and RackSpace.com provide many dedicated servers of different config that you may choose what you need from them.

If you build it yourself or order it from a third party, I would think that the datacenter is not going to provide warranty support. Of course, if you're going to have multiple servers and a spare at the dc ready to go, then having them ship it to you for warranty support isn't a show-stopper.

I think you may have a lot of cheap dedis from Ahosting.biz. I have seen that this company provides them very many and using a coupon code you may have them even cheaper.

try with sago

Why not having a cheap VPS say from JustGotVPS.com before plunge into the area of dedicated servers. Get some experience and money and update it with time.