Here's what I would do - thin that pot out a bit. Often I just snip the seedlings off with a pair of scissors rather than pulling them out. That helps to avoid disturbing the tender roots of the seedlings you wish to keep.
I'd resist going down to 1 or 2 yet, instead I would thin it out a bit to perhaps the 4-6 strongest looking seedlings that aren't right next to one another and give those a bit more time to grow. Then, after another week or so, you can thin them again, choosing the seedlings that are the strongest. In this way you'll more likely choose the strongest plants. It has been my experience that the plants that start from the most vigorous seedlings generally develop into the stronger plants.
You can always thin more but you cannot thin less once you've snipped/pulled them out.