Yes, it would have made more sense for Dooku to have killed Sifo, and then order the clones under his guise. As the book goes, Sifo orders the clones himself, Dooku finds out, and then kills him.
Why on Earth Sifo would do this, and without the Council's knowledge, and where did he get his money? Stupid.

In the new version of CW, I can say that it is clear that Dooku did not order the Clones, seeing as he is not in league with Sidious. I went back and read the script for Attack of the Clones and an easy clarification of who ordered the clones lept out at me, so I restored a variation of that script element to the film and eliminated the distraction that is Syfo altogether.
Its all really quite simple... It took me less than 5 minutes to recut the varying parts needed and get it sounding right.