For a 4 page booklet I would create it as printers spreads, simply because it won't make a difference when getting printed, actually your printer may thank you for giving them printers spreads. Although I would condemn anyone for giving printers spreads for anything over 4 pages.
This will basically give you
4 | 1
2 | 3
as spreads.
To set this up, turn off the Automatically Shuffle Pages, option from the fly menu on the pages panel.
The put page 4 beside page 1, and put page 2 beside page 3.
Then simply print pages 2-3 and select spreads from the print dialog box.
Be very careful of Automatic Page numbering if you are shuffling pages around like this, it can cause you havoc. But you shouldn't need to page number such a small document.
Although there are other methods for doing this. I wouldn't use Print Booklet for such a small project. You could simply PDF the document as single pages and then place them on a new InD document the way you want them to print, for instance. Or with CS3 you could simply place the actual InD document into your new InD document.
Why would the printer prefer spreads in this case?
Well usually, depending on size, they would perfect it, meaning they would print the both sides of the sheet in one pass on the printing press.
So they would put pages 4 and 1, stepped up, on several occasions of the paper. And on the reverse, they would put pages 2 and 3 so it matches up.
There are other ways they could do it, but I'm not going to get into lenghty printing debates.