If you root now you can have the Gingerbread update now and Sense 3.0 but only root if you feel it's the right thing for you to do. Remember if you do decide to root make sure you read all the direction and only move forward if you understand them. Also there are many great members in the hacks section that could help answer any question you have.
I wish I had the guts to root but I don't want to mess up my phone.
I felt the same as you not too long ago. Auto root is easy and it walks you through step my step. Just take your time and do exactly what it says and you'll be rooted in 30 minutes. Unroot only takes 5 minutes should you want to go back at any point in time.