[Pc_Support] Best virtual machine for Intel Mac OS?

[Justin M. Keyes]

I am getting a MacBook (Intel core duo), and I am going to need a
virtual machine to run Windows. I refuse to dual boot, I hate it. So,
I wonder which virtual machine for Mac OS on Intel, runs the fastest,
in your opinion?

Has anyone tried Parallels?
http://www.parallels.com/en/products/workstation/mac/

Has anyone tried Guest PC on Mac/Intel (not PowerPC)?
http://www.lismoresystems.com/en/

Has anyone tried Microsoft Virtual PC on Mac/Intel (not PowerPC)?

Does anyone recommend any other hardware virtualization for Mac/Intel?

Apparently, Parellels is supposed to be more performant, because it
doesn't emulate x86. Does that mean that MS Virtual PC, on an intel
Mac, would be run under Rosetta, *and* have to emulate x86? Does Guest
PC run under Rosetta?

My main concern is performance.

Thanks for your help!

-- 
Justin M. Keyes