what do you say about corehoster.com ?

Actually I have never heard about this host before and can't say anything at all!

I haven't really heard of them either. Have you tried searching them here, and googling them?

Well it look's good but i never tired that

Reseller - Unlimited - * Unlimited Space * Unlimited Bandwidth (Monthly) * Cpanel 11 * Instant account creation * 99.9% uptime * 24/7 Live Support
FREE IHOST BILLING SOFTWARE
$5.99/mth + $1.00 Setup
---------------------------
Sorry, but I can't honestly recommend this. Too much bang for your buck - unlimited doesn't exist. Too much overselling, probably a pretty slow server.
I say - Avoid.

yes
i am searching for big space with low price with good offers
please help me , take me to some reliable comapay !!
tell me about some company you trust

yes
i am searching for big space with low price with good offers
please help me , take me to some reliable comapay !!
tell me about some company you trust
http://www.webhostingtalk.com/wiki/Overselling
You are better off going off with a host that doesn't oversell. Talk to there sales team they may be able to offer you a better deal.

Reseller - Unlimited - * Unlimited Space * Unlimited Bandwidth (Monthly) * Cpanel 11 * Instant account creation * 99.9% uptime * 24/7 Live Support
FREE IHOST BILLING SOFTWARE
$5.99/mth + $1.00 Setup
Also the domain is only a few months old.
i am searching for big space with low price with good offers
please help me , take me to some reliable comapay !!
A server with 250GB space and 2000GB bandwidth would cost around $200 USD per month.
It's quite easy to estimate how much you should pay for reliable service.

You would do really well to pay attention to what people are saying here. You can find horror story after story in these forums from people who "took the bait" and signed up with one of these unlimited, low cost hosts.
Expect to get what you pay for...