You will get at least 2.6 zillion opinions about this.
Mine:
Most any pipe will give you a performance boost in the upper revs, and take away from the bottom end as compared to the stock pipe. I say if you can get them for real cheap, go for it, if not, wait for a pair of pro circuit or FMF gnarly pipes. For YOUR situation, though, the first thing I would recommend is to bump up your compression. This will give you some much needed grunt on the bottom end. Something else you should do is when you pull your head offf, go ahead and pull your cylinders off and do a "clean up" port job, basically smoothing out the flow. While at this you can match up the liner to the exhaust port (aluminum part). This, in conjunction with the head mod will give you a very noticeable boost in performance and grunt for climbing those hills. You might be happy with this for now and save some money.
That said, I don't know much about the ct pipe. However IMO, it is worth waiting for a set of pro circuits, which you really can't go wrong with unless you have a dedicated drag bike.
CT products are typically well above par, though...