As stated right now I am not wanting to upgrade my glass, I am happy with what I have I was just trying to decide whether or not the 18-135 would be a good idea to replace my 18-55 and 28-135. The glass will be upgraded in the future but right now I need to focus on upgrading the body
Stick with your current glass. The 18-135 won't give you anything you don't already have, and you probably have better performance with your combo because there are fewer trade offs to contend with. The 28-135 is usually considered better than the 18-135. Upgrade your body and see what that gives you.
You have a pretty good range covered. If you decide down the road you have a need which those two do not meet then you'll have a better idea what to get.

