Ubuntu :: Fastest Booting OS ?

About finding the fastest booting operating system is out there.

I'm especially interested in Ubuntu Netbook Remix and Intel Moblin, and when my internet comes back tomorrow, xPud. I'm kinda freaked at Moblin though because there isn't an option to split the hard drive to account for its space, and even if there were, I'm freaked that a GRUB won't show up Ubuntu or even Windows 7

My requirements:

1. Boots up in 5-15 seconds on 1.3GHz processor/4GB RAM or within 10 seconds on a netbook which has 1.6GHz Atom and 1GB RAM

2. Has to have a good-looking window manager (so a customised Linux distro with something like Fluxbox/Blackbox is out). Something like what's in netbook designed OS's are good

3. Has to actually be able to run good on laptops that aren't netbooks, for I'm hoping to run the OS on proper laptops too

4. Can be propiertary, though open-source and free is good too and preferable

5. Has to have a GRUB so I can switch between Ubuntu/Windows 7/whatever fast-booting OS it might be or at least an easy way to switch between the 3. More preferable is that it comes as an .exe that can be installed inside Windows, like xPud