High Peak server

We are looking for a server which will allow us to have 2000 or more connections simultaenously on the same page (flash page of approximately 200Kb). These users will be entering data into a mysql database (only few Kb, mabey 10/20).
What is the best solution for us?
And if the number of users were more? (3000/4000/5000/10000)
Thank you,
Augusto

Forgot to mention that these peaks will happen only once a week.

[Sam]

For that many users; i think you would need a dedicated server or semi-dedi server