How many of You, would like to invest in computer with guarantee of safety (or just very, very safe)? There is no totally safe computers (with safe system) ready to buy on the market.
There are a number of computers and operating systems that are secure for running Armory offline -- Armory builds are available for Windows, Mac and Linux. Any LiveOS is considered secure for loading and printing BitAddress paper wallets.
It is the connected computing systems that carry the risk. With those, bitcoin's primary line of defense (passphrase encryption) can be bypassed with malware that performs keylogging. All operating systems for consumer or small to medium business (SMB) use are vulnerable to malware such as keylogging software either due to exploits or due to user not following security measures that are adequate.
What do you think about idea: having computer only to work, invest, storing important data, etc.?
A separate computer ins't always necessary. For the example earlier, a LiveOS boot allows a system to serve as a secure device for running a Bitcoin client in an offline configuration (e.g., Armory) or to create paper wallets (printing from BitAddress).
There is much progress on Bitcoin-specific hardware wallets:
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http://en.bitcoin.it/wiki/Hardware_wallet