A 50l pot is 13.2 gallons, not big enough for a 10 gallon boil imo. I always do 5.5 gallon batches because you'll lose .5 gallon to trub and what not. So with boil off you'll be doing close to a 13 gallon or larger batch. I would go 15 gallon minimum for '"10"gallon batches.
You can't go wrong with the biggest pot you can afford. I have a 15 & 20 gallon and do mostly 5.5 gallon batches.