The SB12 is $699 - $749, and the PB12-Plus is on clearance for $799 in most finishes right now, including all the woods and piano black.
I wouldn't put the SB12 on the end table for fear of the drawers rattling. Two SB12's would give smooth response, but that'd be way more than the PB12.
Personally, i don't think i could stomach the fact of a drink hovering over my new sub, either on it directly, or on the table directly above it, so i'd probably opt for the other location