Well, there isn't an exact release date set for the Toledo yet so it's hard to, I am personally hoping for July or August as that is when I would like to build.
Anyways, from what I have seen and heard, the new Toledo will basically outperform every AMD Athlon 64 on the market right now except for the 4000+, FX-53, FX-55, and any other processor that happens to be released between now and the release of Toledo.
Basically, you have to ask yourself if you want to wait for something that will perform better than a 3800+ or lesser processor.