isolation transformer vs line conditioner

I have a single pseudodedicated line ( line form fuse box at home only supply stereo equip. & lights of that room.)
I am considering a line conditioner like BPT3.5 or shunyata hydra at the outlet vs an isolation transformer interpose betw. the fuse box and the outlet in that room.
Which would provide most bang for bucks?
Where can i buy isolation transformer cheap? 5kv topaz is more than a grand.
WHich LC is better? shunyata or bpt?