I voted for 550, since that's the highest total that seems to have a chance to win. If 530 wins, that's fine too. It's all in the distribution anyway. That's really where the discussion will be interesting. However...
(tl;dr follows, since no one else is really making a discussion out of this poll)
I think it's funny that no one is voting for 580-600. But, it seems like everyone's team looks like this: Salamence, Garchomp, Tyranitar, Metagross, Cresselia, and Blissey. People lean SO HARD on the pokemon with the big stat lines. It doesn't matter if their team concept sucks and they can get pwned by anyone with half a brain and half the BST.
Who wants to lead with a 515 BST Yanmega hoping to flinch with a 75BP Air Slash? When you can throw a 600 BST Salamence out there to drop a 140BP Draco Meteor on their ass, cut their attack with Intimidate, and after Mence's impressive 110 base Sp Attack drops through the floor, you can follow up with any number of big-BP physical moves powered by a staggering 135 base Attack! Yeah right.. Yanmega ftw.
But, hey, everyone plays Blissey, right? And she's only 540 BST.
So, by all means, let's act like we don't need any more 600 BST pokemon. Total stats don't matter, right?
If it didn't matter, all those 600 BST pokemon wouldn't be so incredibly OU. Why do you think we have to deal with stuff like SpecsMence and Boah? It's not because the pokemon is geared for that. It's because somebody woke up and noticed that even though these pokemon are basically physical hitters, when you spread around 600 stat points, it hard NOT to have a pretty damn good Sp Attack as well. And it's not like these things are glass cannons either. Defensively, Tar speaks for itself. But, Salamence, the non-wall of the 600 BST crew, is still packing 95 base HP, which is only slightly below the commonly accepted line for a "damage sponge" designation (creating 100HP subs and whatnot).
If 580-plus was relegated to Ubers, then it would be a different story. But these pokemon are all over the place in OU play. Yes, they can be countered. But, good grief, the stats alone are a very big deal. Garchomp is a freakishly powerful pokemon. And it's not because it has a movepool to die for. Heck, most people only use 3 slots on the damn thing. What's the difference between Chomp and Flygon? (Well, lots of things, actually) I guarantee if you gave Flygon those extra 80 BST that Garchomp got -- Flygon sure as hell wouldn't be BL anymore. And I don't care where you put the extra BST. Put 80 more BST on Flygon in any combination of stats and that pokemon would shoot to the top of the OU ranks.
Yes, yes - I realize the movepools and abilities make this a difficult comparison (Chomp vs Flygon). But, my point is this - Base Stat Totals matter a whole, whole lot. And everyone out there voting for these 530-550 stat lines are a bit hypocritical considering that everybody runs so many 580-600 BST pokes on their teams.
Personally, I like pokemon with more "purpose". I voted for 550, but I actually think the pokemon would be more "interesting" at 520. Unfortunately, if this has any hope of being an OU pokemon, it has to have a big stat line to back it up. It doesn't have to be OU btw. But I hope it is -- just my opinion.
If I honestly thought 580 had a chance to win, I would have voted for it.