Putting Sg4 in there seems like a really bad idea. If playing 2 maps gets boring after a while, then EVERY SINGLE GAME being Sg4 would be a nightmare. Sure, they could add Breeze to add a little variety, but then we'd be right back to where we were right before v2 was released.
In my opinion, I think they should add some more maps, but mainly the bigger ones. I don't mind if some of the newer maps are brought over. It would still have the same survival feel that these servers are trying to recreate. I think these servers shouldn't be just about remaking the summer 2012 games, but improve where the original servers went wrong. I think a good starting point would be to add Sg3, but fix the problems that caused people to dislike it in the first place (stuff like the mobs at the start). I can't help but think that Sg3 could become much more popular if it wasn't buried at the start and played very rarely afterwards. Maybe add Overgrown too, and see how that goes with Breeze not in the poll. I forget if it was played a lot more in the 48 player servers rather than the 24s, but if it was, maybe not having Breeze in the poll would give that map another chance. If it wasn't, then I guess there's no real point in adding it again.
Not that I'm saying the smaller maps are necessarily bad, but they basically started the whole v2 style of gameplay (I don't believe the plugin was the main cause), and if the Classic servers are trying to avoid that, then they should avoid adding those maps. Someone said that the addition of Sg4 was the end of the Classic era, but I think the end started at Breeze, because that's where the whole "quick pvp games" started.