
Invicta59!
I do not know of any STBs planned or present that have dedicated composite video outputs. But as nffc said you can buy a Scart adapter that will break out the composite video and audio for you.
There is a PVR that is planned for the end of 2005 that ought to have two tuners (although nobody knows for certain yet) but it is very unlikely that will have composite video outputs either (in fact it is almost certain not to).