I have an ETX 80. What I use with mine is Meade 4000 series Plossles. I have better and definitely more expensive eyepieces, but I run into space issues when going after something high. The 4000 series Plossles are reasonably in keeping with the price of an ETX. To get anything with a wider field of view to work well on that short of a focal length scope, you have to spend a lot more money.
Most likely, the 26 mm is about as long of a focal length as will be useful. With that one, you can get about a three and a half degree field of view, which about the limit without the outer edges of the view going really nutty. From the 26 mm, I normally drop down to the 15 mm, and then to the 9.7, etc.