The PC 122 is probably as small as you're going to get for a small package CB with SSB.
If you wanted something that looked more like the Pro 510, then you'd be looking into the 640e. But they're not compact.
Of course I haven't read much into the new 980's yet but it seems in addition to SSB, you also get a freq counter, weather bands, talkback, memory/memory scan and scan, digital SWR calibration...all wrapped up into one radio. A big advancement from the chrome knobed/silver brushed faced radios of the past.
Only thing I don't care for is I wished they had a big analog swing meter, like the Galaxys do. That and how they emit a beep when you go to turn the channel or push a button.