How much is the server costing you? I'm currently using Digital Ocean because it is cheap, although they don't guarantee bandwidth. If AWS does, it sounds like an option. I already use there S3, Route 53, and CloudFront services on other projects.
Are you going to be streaming out at 320 Kbps? Seems a little high, although I can understand why. But it will chew up bandwidth, both yours and the listeners. You'll max out at around 2344 listeners with that throughput, but I would allow for head room on that figure.
Personally I'm setup an AAC stream at 192 Kbps, in addition to a 128 Kbps in MP3 that I already run. The MP3 stream works perfectly on the mobile via 3G.
Matt
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