The problem with the idea of using his bookshelves as surrounds later is that he doesn't know what his future room will look like. If he has a setup where he can place the bookshelves on stands to use as surrounds, then great, but many, many rooms don't end up working that way and people have to use in-wall/in-ceiling or something otherwise mountable speakers for surrounds. If he wasn't dealing with a limited budget, I'd say go ahead and get what you want and if you have to sell and rebuy once you're in your home, fine. However, if you're in a situation where you only have a very finite budget, you want to make sure you don't waste any of that budget and (in my opinion at least), buying speakers before you know the size and configuration of your room is a pretty dicey thing to do.