Looking for modem compatible with Optimum

Solution
I would suggest going to the forums for your existing router and asking fpor recommendations ... without optimum support, you are going to want support available from somewhere and having the same brand gets you away from the auto "its the other guy" response. Also be aware, if you have a problem, and Optimum comes to troubleshoot, watch them carefully. They seem to like to fix a wire, come inside to check and then say "Oh ya problem was with **your* equipment".