As stated above, I am looking for a pair of tweeters that performs very well off-axis, post up what you have and a price with them. Higher sensitivity is always nice also.
This applies to just about any tweeter. If they're too quiet off axis, turn up the levels. With your setup that's not a problem. What falls off in response as you get away from fully on axis is the top end response.
You obviously don't have too much technical knowledge, the dispersion of a tweeter is a large factor of how well it does off-axis. The harder the dome, GENERALLY, the better it does off axis. There are many other factors as well, but dispersion is one of the biggest ones. So before you come into my WTB thread and try to tell me to eq it out, do your own research.
i might have a pair of Vifa 4 ohms tweeters that may do the job well. by no means pretty, but they work real good. let me find and dig up a model no. if i can.