I'm actually leaning towards the SA being one of the important builds early on. Along with HR. Possibly. But I haven't decided yet. I kind of like the idea of a good pull having decent OR(to sell for more money so you can add more seats), but I'm not sure if the financial commitment is worth it.
As far as having the math to back up anything I'm saying, of course I don't=) All I can say is that hundreds of players have done it the other way and no one who didnt start on day 1 would have made the playoffs if it weren't for everyone at the top of I.1 quitting. I was ny a season and a half behind and I certainly wasn't going to get there. I was already being forced to limit my staff just so I could save all season just to build one thing. I needed to do something that would make me money. So this new direction seemed like the best way forward. Ad I felt I should put everything I had into to get it over with ASAP. Hence the rebuild to go along with it.
The important thing to remember is that this will not cripple you financially like I was worried about when I first started this. I was an awful team coming down into III with a massive stadium. Last place two seasons in a row is about as bad as it gets. But the Media deal has covered all Arena expenses through the worst of it. Thats all i needed Until i get back into II. And I would bet that my ticket sales are comparable to most other's ticket sales and Media deals combined. Not including I.1, of course. Although I do have better attendance than most of them.
Also, if you ever feel like this is not the way to go, then it only takes one season to build your facilities up from level 1 to level 9 (I think it was 9). Providing you have the money to do so. Which you just might do if you've built up some Triples first