Ubuntu as main OS + Windows on VirtualBox?

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http://askubuntu.com – I've been playing around with Ubuntu only for some short time and I really enjoyed it. I want to buy a new laptop, and the thing is, although I have mac at work and it's great to work with, I don't want to pay 2500e for a new laptop. I'd rather pay half and spend the rest on a trip to the Caribbean. So, I was wondering if I could buy a powerful PC (maybe i5 or i7 quad core and 16G of RAM) and use something stable and fast like Ubuntu as my main OS, with Windows 7 setup in VirtualBox. I need windows because I will still need to use FlashDevelop (only on windows) and Adobe Flash IDE and maybe (HowTos)