I would start with something like this:https://www.projectorcentral.com/Epson-PowerLite_1781W.htm
The Epson 3LCD layout tends to provide better color brightness and Epson tends to be more honest about their lumen rating than the competition. LCD color brightness is a major factor in LCD advertising.
These are also a much slimmer design than your previous models which should make transporting them a fair bit easier.
For a bit more zing in the presentation, they also have a higher resolution model of the same thing...https://www.projectorcentral.com/Epson-PowerLite_1795F.htm
To really get more, I think you have to go from that size up to the 6-10 pound range of models (twice the weight at least!) and in DLP I would look for 5,000+ lumen models and for LCD I would go up at least to 4,000 lumens or higher for a solid bump up in brightness.https://www.projectorcentral.com/projectors
- Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.