Any1 knows a super fast file download host service ?

Hi,
I'm making a legit shareware & noticed 30% of my visitors never finish their trial download
Current file is about 250Mo, but futur project could be up to 2Go. Although my current www provider is decent, we all know standard hostings are not made for big file downloads.

> Can you advise a hosting services dedicated to big files ?

Criteria:

1. super fast!
2. no download manager to install
3. open (for visitors: no registering, no password)
4. medium or big player (=is here to stay; don't want to search for a new provider every 3 months)
5. plug'n play solution (ex.: no setup of a dedicated server on amazon cloud)

Thx,
F