Jacketpotato: you say that you need a first from a top 10 uni or a 2:1 from oxbridge to get into a US firm, but that is quite frankly wrong. I'm going to a top US firm paying 90k+ NQ and there are many people in my intake who you would not consider to be from 'top 10' unis. Those firms are not quite as elitist as many people make them out to be.
Also I'm unimpressed that you said a barrister's earnings are dependent on how good you are, which implies that solicitors it is not when obviously it is. If you aren't so good the best firms won't have you. Further, there are 'pay bands' for associates and if you aren't as good as your peers you will earn less and will get a significantly lower bonus. Also, the top US firms who you go on to talk about do not suffer low billing. IN the MC you get lots of people who never meet targets yet get kept on at the lower end of the pay band because of the way they gear their teams (1000s of associates who only ever do due diligence etc). In US firms this does not happen: you must hit target (and in many cases beat it) in order to be kept on as they work in much smaller teams who get much more involved in deals yet everyone pitches in on the DD.
You are, however, correct about the hours.
I'm impressed that no-one has come into this thread and said "omg no way you can't be a solicitor all you care about is money lol" YET. I'm glad the OP admits that they like the financial aspect ofthe job, rather than lying about wanting to 'grease the wheels of commerce' or some other vomit inducing comment.