I've only got about two weeks with the WRX but if you are looking for speed then you are looking at the wrong bike. If you are looking for a bike that you can flog, flick and generally ride like a retard then it might be for you.
I to contemplated the DRZ since it has a little more juice on tap out of the box but decided on the WRX because of its F.I. and its fit and finish. The DRZ is due for an update IMHO and I would bet Suzuki will soon undertake that adventure once it starts realizing the little WRX is cutting into its sales.
I can say so far no regrets on the WRX, its a fun ride and I'm coming from a laundry list of different bikes most recently a HyperMotard and a 1098. Its all about what you are looking to accomplish when riding.
"If you can't fix it with a Hammer it must be an Electrical Problem."