First and foremost.... a 2ct in a cushion is going to vary wildly in dimensions vs 2 cts in a round. They are just not the same animal. So prepare yourself for that.
I guess the bigger question is what kind of "look" are you going for? Antique all around? If you like the look of the AVC/Antique style, do you like the idea of a warmer stone? That's the question I am asking, really. Color-related. Like an L/M color? Or would you like it whiter? That is something to think about. I tend to like the AVCs around a J-K. White but with a little more warmth. They're designed to look "older" but they're cut well. If you go lower in color, you can get a larger stone, and or cleaner stone. I personally am a clarity freak, so that's something that would be on my radar. The higher the color, the smaller or lower clarity you'll need to go. But a 2ct in that cut on your budget (assuming 25K is JUST stone budget) is doable. If that includes the setting, you might need to balance your specs and maybe go just under 2ct.
I would recommend if you're residing in the states that you buy within the states otherwise you're going to be dealing with duties and import taxes you don't want to be taking from your budget.