Since it is important that the visitor select a language, this is one instance where a splash page of sorts is needed. However, I'm not so sure why you want a section for high and low bandwidth. You should concentrate on your site being usable across a wide range of browsers and connections.

Many times, having duplicate content, even that used for aiming at different bandwidths, can get you penalized. Some, using lots of animation such as Flash, won't have content to index anyway. So, there is really little point in spending the time (money) and energy in building a site that may be ignored by the SEs, if that is where you expect to get a good share of traffic.

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DrTandem's San Diego Web Page Design, drtandem.com