How to stream mp3 scalable and cost effective?

We are a startup that needs a scalable solution to stream mp3s. There are different ways of doing this, ideally I would like to get some suggestions and learn from the experience some of you guys might have. Currently we have the following options.
1) use flash media streaming server ($1k). Advantage, easy to build, our team has experience, however no idea how many concurrent transactions it supports.

2) use red5 to stream mp3, free, not much documentation would be a new project.

3) use progressive streaming with lighttpd or Apache - seems the fastest and cheapest way, however mp3 streaming requires a modification to the flv streaming module (in lighttpd), not sure how reliable that one is. No idea within apache how well progressive streaming works.

So anyone please share some information about Adobe, how scalable it is, how many concurrent connections it supports. Then on the client side with progressive streaming, can I use a flash player on the receiving end? How hard is it to implement for a team that hasn't done it before. Any other help, suggestions you have.
mobile1Asked:
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mobile1Author Commented:
ok found the answer myself...since we use AWS/EC2 and S3, wowza for ec2 is the best answer. Can handle with the xl instance about 11,000 streams for our applicatoin, and can stream straight out of s3. Adobe has issues with s3, and progressive streaming is cheaper but less reliable and client dependent...

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