I would still improve the motor dish, using
bill of oz suggestions above, and keep it for being able to get virtually anything in the sky.
Then, I would add a fixed dish, with no more than 4-5 LNBs, since the signal gain drops down for LNBs positioned more distant from the central focal location.
For a
bracket I would suggest something like this:
It has 2 axis rotational, 2 axis sliding movements and
LNB axial (SKEW) adjusments.
This and others can be found here:
http://rover.ebay.com/rover/1/711-43310-8196-0/2?mpre=http%3A%2F%2Fcgi.ebay.com%2FBrand-New-3-LNB-Bracket-for-Ku-Band-Satellite-Dishes_W0QQitemZ370136433855QQcmdZViewItem
or just google on eBay for
LNB bracket, LNB Converters.
Depending on what LNB and switch you may have with the motor dish, replacing it, or adding another switch, would enable easy combining the motor dish and fixed dish signals to a comon cable run to the receiver.
I would also think of having all Standard/Legacy - Dual LNB models for the fix dish, as this would enable future expanding for multiple receivers.