What Should I Choose, MAC VS. PC Options

[sampoo]

Hi All,
I'm not posting because i wan't to start a mac vs. pc discussion but i just can use some good advise. At the moment i use a PC in my studio wut i need to upgrade soon.
My PC isn't stable and i'm a bit tyred of al the bleu sceerns, lost work and reinstalling windows, ... so i'm thinking of buying a MAC. There are a couple of things i would like to know and i hope someoone can help me out.
1. I'm used to cubase and i would like to keep using this but will cubase run smooth on a MAC (sice i heard it was written and optimized for the PC)
2. I use Wavelab and Soundforge on my PC now but both programs aren't available for the mac.
Witch (good) audio recording/editting software is there for the MAC
3. I called some local music shops who tells me that nowadays pc's running windows xp are just as stable as the MAC. Any people here who use both or are recently switched from pc to mac?

Thanks in advance
alex