Players that could be on your roster for 10+ seasons and help carry you through to D1?
though I half think I may aim to have more lower tiers than bleachers at some point just because that would give immense giggles
That would be amazing. A pity that season ticket holders for D1 tops out at just over 4,000. This guy in USA D1 has the most I've ever seen. (http://www.buzzerbeater.com/team/23816/arena.aspx)
If that's how we define longterm players, I do kind of have those. I hate them all, of course, but I imagine at least three of them will be playing regularly for me in 10 seasons time. It's just different for me this time since I'm doing so much 1v1 to start with rather than buttloads of pressure, but I figured I'd try to do *something* different.

I think a 4600 - 5000 - 500 - XX arena would probably be horribly inefficient but it might be fun enough to do that I'll go for it. It's certainly exceptionally cheap to pile on bleachers after I reach that point if I decide to. If nothing else, it'll be an interesting data point.