Dual boot Ubuntu (14.04) with Windows 10

Solution 1:

I've been dual-booting Windows 10 preview for 3 months now: no problems whatsoever in BIOS mode... (No UEFI here!)

However, I have 2 hard drives in my machine and change the boot order to boot from one hard drive or the other one. I did run for a week or so from one hard drive, but something got screwed up, so I reverted to booting from 2 hard drives again...

And as to waiting: you can always wait for the new CPU, the new Windows, the new GPU, ... If you're out of time to wait, get a system with Windows 8 and dual boot that as Microsoft has announced that anyone with a Windows 8 system can upgrade for free within one year...