What do you plan on running with 125a sub pnl? When you run the feed, make sure, (as you said" want to do it right", that you protect it . How are you running the feed, underground, overhead? If underground run it in "pvc", and MAKE SURE YOU PULL A GROUND WIRE appropriate for amps you intend to pull, and put in a ground rod! I know it might sound like overkill, but better safe than sorry. I got hug up on 120v 20a circuit, return "the neutral", let's say I had a real bad day at the emergency room! People think that you can't get hurt on 120v 20a, WRONG, it kills more people than high voltage. Just be safe,
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Jeff
The ONLY true thing WE OWN and have to GIVE is our WORD. I did what others did not want to, and became what others could not, now the best "REVENGE TO WAR" is to live the best I can.