Stade Pierre Mauroy (Lille's stadium) in my mind should be our aim, but perhaps 55 instead of 50k.
Multipurpose so could be used beyond the 45 days a year of football for concerts and other sporting events and as such would be much better as a money maker for us and the city.
Cost £206m pounds for the stadium and another £30m for parking and transport infrastructure as well as commercial developments. Probably looking at a similar cost here.
You've got to look to the future when building a stadium, and whilst 50,000 might not be sustainable at this present moment in time, in 10 years time it may well be, and we will be annoyed at not having a bigger stadium. I know one of my main 'stay away' points from goodison last season, was that there were so many ST holders, that it was extremely difficult to get a season which wasn't obstructed, luckily, a lot didn't renew and has eased this substantially this year, i'm sure however, there are a lot of fans in the same boat as me, who won't go to sit behind an obstruction for something like Hull City in midweek at home, the week before christmas.
55,000 presents an opportunity for slightly cheaper tickets, in order to get bums on seats, to get a new generation of fans in for cheap you could easily stick a family enclosure in one corner with Dad and Lad for £299. As for the concerts etc... due to excessive costs and such, you'll find that most bands would probably skip out Liverpool entirely, and just use Manchester, which has a far greater catchment area than Liverpool, (Leeds, Chester, Sheffield, North Wales, Blackpool etcc, are all accessible by train running after 11, whereas Liverpool has one train to Manchester, although you could argue, this would help with hotels), but it could easily host International Football, Rugby Games (League and Union), European finals.
However, doing this would require Everton to spend money. Therefore, all invalid. Not happening.