Best alternative for my surrounds

Hi all,

I'm looking for the best alternative to replacing my Paradigm Studio ADP 470's with some in-ceiling surrounds. I know it's not ideal, but I'm left with no choice.

Is it important to stick with Paradigm? I've read good thing about RBH, but other than that, many people scoff at the idea of in ceiling speakers and there's not much available.

This is for a home theater in 5.1 What else is available under $500.00 and I don't mind buying used if there's other options available.

This has been a thorn in my side trying to figure out how to make the ADP's work, but it just wont so any help is greatly appreciated. Thank you.
Personally I would stay within the Paragigm line and try to match the "voice" as much as you can.
would the paradigm ams series work well for surround? For example, ams 300?
If you go with in-ceilings, look at dipole or speakers where the tweeters can be aimed. The last thing you want is to be sitting directly under the tweeter. Set it up so they can be aimed away somehow.
Elevick, that's why I was considering the RBH speakers because the tweeters can be adjusted. I was just worried about sync and timber issues with another speaker manuf.