Won't you have to change the channel anyway? WIth DTA you have no idea what channel the Mini will be on when you go to LiveTV.
BOLT(500GB)/Roamio Pro (5TB Red)
TiVo Mini x4
Roamio Basic(1TB Red)/Roamio Basic refurb(stock drive)
53TB unRAID2--38TB unRAID3--34TB unRAID1a