Check into the MSR Simmerlite and the Brunton Optimus stoves before you buy.  I used to use a Dragonfly but these two are my primary stoves now.  Both simmer well, but the Brunton is about as good as it gets for fine-tuning the heat.  Both are quieter than a Dragonfly though the Brunton is the noisier of the two.

I'm known to be somewhat of a gourmet kinda guy on the trail but I also travel hard, so versatility and light weight are key to me.  The Brunton is like cooking on your stove at home and the Simmerlite is about as light as you can get for a white gas/multifuel stove that still has adequate simmer control.  It's a pretty good tandem.