Id agree that how far you hit your 50* is really all on you, depending upon how fast you swing. Id say that 100-110 yards is a pretty reasonable expectation though. If it were me, Id go with a 54* and a 58* wedge. That would give you a nice, even spacing and a 58* would be slightly easier to hit than a 60*.
Im not a believer that you should be a single-digit handicap in order to hit a lob wedge. Im about a 20 handicap and I love my lob wedge. Its a great little club for shots around the green. Its just a club that you have to be careful with because with the extreme loft, it can be a difficult club to hit solidly out of a bad lie. It used to be my stock go-to club for all shots around the green and sometimes that caused me to either hit it thin and hit a bullet that flew twice as far as I intended, just as it was easier to hit it way fat out of a juicy lie, and have the club slide right under the ball, making the ball go about half the distance I intended. Now, out of questionable lies I will hit my 54*, which is an easier club to hit solidly because the loft isnt so extreme. If I need to hit a high shot, I can just open the face up a bit, which engages more of the bounce anyways and makes it even more forgiving to hit out of a bad lie.
IMO, much of why people get into trouble with the lob wedge is they always want to use it around the green and they always want to hit a shot that flies high and lands soft, which is fine but with that kind of a shot, just where the ball will stop depends upon spin and you never know just how much spin you are going to get out of a bad lie. Given the choice, hitting a low, running shot is a much safer, much more predictable shot. However, you may not always have the option to run the ball up to a hole, which, IMO, is why a lob wedge is an important club to have in the bag.