I assume you're talking to me.
The distro of Solaris that convinced me that Solaris' kernel is faster than Linux is Solaris. I'm basing this off the stats I saw from somewhere else online. I've tried regular OpenSolaris and Solaris on the Sun Blade workstations. Both are kind of bland, OpenSolaris being less so since I could play it on my computer. Personally, I can't tell the difference since I mostly use Linux - lol. I prefer using the Enlightenment desktop and I don't know of any Solaris distro (what few there may be) which uses e-17 desktop.

This is where this thread started.... Again I'ld suggest PCLinuxOS ( Very Windows User Friendly) as it is only 1 cd and can be fully operational as a live cd before you commit. Note also that a variant is targeting SOHO, called "bel" ( Business Enterprise Linux ). If you are capable of getting involved then here is a distro that is targeting business servers - Window Users friendly and vary active within its forums.

I'm new to Linux, but see you have not replied to any suggestions so far and I guess mistakes I make will be corrected by others. So:

If when you say ''duplicate most of windows structure...''. You want a system that has the same file structure as Windows. Where things are stored and can be found in the same way. I think your going to have difficulty. The Linux file system does not look like Windows and needs to be learnt. Particularly the faster and capable versions.

I hate saying this but Windows is helpful in giving things names based on the function they carry out. In Linux for example, KPPP is a useful modem setup and Internet dialler utility. But you would hardly guess so from its name, and this is typical.

Being able to install and use 10 different Linux distributions suggests you have enough system and video memory to run major distributions. So choosing a distribution from somewhere like Distrowatch.com you may not be restricted by hardware limitations. I also like Linux Forums, see http://dir.linuxforums.org/category/72/, from where a 'brief' introduction to each distribution can be found.

Windows has changed over the years. Windows on Dos 5.1 holds fond memories for me, but besides the commands that remain in use how to use this old software is forgotten. Linux is changing fast and if your happy to pay for your Linux the choice becomes even wider.

I suggest you start with a distribution that you find the easiest to use. To what the others have listed above I would add Mepis, but am writing this using 64 Studio. If you can change hard drives, get a second drive and experiment on the second drive. Disconnect your working drive while experimenting. Transfer your data using the backup copies you have made to CD or flash drive when you want to access it from a new distribution. Changing application default settings will give a chance to learn more about the apps.

Boring I guess,but hopefully helpful.

HELLO
I would suggest g os for a great linux operating system.
I tried ubuntu about 1 year ago a didn't like it.
I too myself have now switched over to linux from windoze and this is the best os i have used for new linux people.
It is still in the beta stages but windoze hasn't been right since they killed xp.
Just type g os up in google and it will be the first one
Hope this helps you out
Cheers
Dave