Is that a cobra 25ltd classic? by the way, if you need any radio advice I'm an electronics technician and I used to work for a CB shop before I got my current job.
Honestly, you really don't need a power mic for that radio if set up properly. A linear amp to boost your power output will work just fine. One of the finest is the Texas Star DX250. Easy to match to the radio and doesn't put too much draw on the electrical system.
Anyway, nice radio