Stay away from anything that uses a piezo driver....you want true HLCD that use actual compression drivers.
Image Dynamics CD1Pro's and CD2 Comps are both good. I don't pay much attention to USD Audio (but they aren't for sale on the forums much, either //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif , so you probably won't find much if any for sale), but anything above their piezo-based horns are good. If they happen to pop up, the Illusion Audio CH1 horns are good (comparable to the CD2's).
Or, you could build your own //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif B&C Neo compression drivers can be found on
partsexpress, and are very similar to the ID Neo compression drivers. The Radian 450PB on
Partsexpress is the same driver used in the Illusion Audio horns. Just mount either of those up to the ID horn bodies (which you can buy separately), and you're good to go after some EQ work.
Also, you need to figure out if the full bodied horns will fit in your install, or if you need minibodies. In your situation, since you can't go below 1.25kzh anyways, I'd suggest you get minibodies for ease of mounting. An advantage of the full size bodies is that they can play lower....but since you have a finite highpass xover point, that won't help you much //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif IIRC the minis are supposed to be a
little better in the midrange area anyways.