The only rigs where I don't run an external BEC are two of mine with Viper VTX8 ESCs (which have a 7V/5A Internal BECs). In theory, the BRXL at 6V/5A might do fine with a not over-the-top servo, but I decided to play it safe on mine. Sounds like you're going with the CC BEC, which is good.
For servos, I like going WP out of the box (after Hitec gave me a hard time on a warranty issue with a 7950 that was unrelated to water). And with all due respect to OSRC "thumbsup", I like being over 250 oz on a 1.9 that will get pushed a bit. The Savox 1210 and RC4WD Waterproof Twister both fit that bill, retail under $85, and have performed very well for me. The 7950 would definitely be overkill (I used to run it in my SCX-10 before switching to the Savox 1210). The 7955 would be fine at 6V, but you'd have to do your own waterproofing if you want to get wet (and void the warranty in the process). That's why I would take the Savox 1210 or Twister WP and save $20 +/- and the trouble of waterproofing a servo.
Look forward to seeing this back in action!