Expectations for MPEG2 - H.264

I have some recorded television broadcasts on DVD (SD-PAL). On average 4.5 GB for 120 minutes per DVD, say about 5000 Kbps, if I am not mistaken. In the hope to reduce this appreciably by encoding in H.264 my question is: What sort of reduction/bitrate should I aim for in Compressor resulting in more or less the same quality in replay? I am aware of the fact that an exact answer cannot be given because of the dependence on the contents. But some rule of the thumb will be welcome.
Hans van der Meer

It will not make DV look better, it is a MPEG4 based compression format for material to be delivered over the web. As such, encoding your material to it it is the last step in the editing process.
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