Hello to everybody!

First of all I want to make congrats to everybody here, cause I really like the site. I'll be sincere, I'm new to this kind of music, and I relly love it! I don't know If I know as much as You know aboout trance music, and I would be happy if somebody of You would be so kind to answer som of my questions...

What's the difference between Hard Trance - Trance - and all the other Trance songs?

I really love songs that give You a really pleasant sensation, some of my favortes are:

Alt+F4 - Alt+F4
Orkidea - Beautiful (Alt + F4 Remix)
Siberian Sun - Frostbite (Fred Baker Remix)
Whiteroom - The Whiteroom

& a lot of ATB tracks

and wanted to ask If anybody can suggest me tracks similar to these, I mean...tracks that give You this kind of feelings, like You are flyyyyyyyying...

Please, share Your knowledge...THANKS!!!!!!