Do you try to stagger the purchases or buy them all at one time?

What i mean by that is, say you have an idea for a new site, do you buy the content, scripts, designs, etc in one go or buy them one peice at a time, work on that part, then buy the next thing you need etc?

I have to say that as of late, ive been staggering the business purchases ive made and, it actually seems to be making me more productive during the development stages of these new projects im coming up with.

Rather than having to worry about stuff that is 'on hold' im finding myself spending more time planning whats happening and working to a specific deadline, which in turn, is making the projects come together a LOT quicker than if i had bought everything at once.

Just wondered if anyone else was staggering their business purchases or whether you buy everything at once?

Regards,

Lee