My personal recommendation would be a Magnum 257HP. Small/compact, drift-free performance, all modes, variable power, and will give you 60-65W SSB with no fuss all day. Have it properly tuned by a good tech, set it and talk on it! The only thing I'd do is remove the speech compressor, as it tends to make the audio a bit "muddy" if you really get into it. I removed it on mine and it made my audio smoother.
Galaxy and Connex radios are known for drift problems, I'd stay away from them since you're planning on running mobile where you'll have warm/cold environments. Good luck!
~Cheers~