What are you updating on the current revo?
Personally I would not buy an E-Maxx, especially considering the brushed model can destroy itself on nimh batteries, I can't even imagine what the brushless version could do to itself. I would for sure go with the new E-Revo before an E-Maxx, Traxxas really did their homework on that one.
Are you looking for something similar in size to the E-Revo or E-Maxx.
Are you stuck on Traxxas?
I've heard a lot of good things about the Team Magic E6 III BES can also be found under the Team Redcat TR-MT8E BES6
Team Magic Model Industrial Co. Ltd. - Team Magic TM505006R Team Redcat TR-MT8E BE6S 1/8 Scale Brushless Monster Truck
https://www.youtube.com/watch?v=fiyj9FkjCSQ