The wattage drawn by the AVANT with VCR is actually 185 watts at 240 volts.
The other member (Link previously provided by Peter) with the same issue purchased a 300 watt transformer because the AVANT does not have a large tolerence on mains voltage and if you purchase a transformer just above the actual current drawn it is likely to saturate and so not provide voltage within the tolerence range. Also remember that you are running at 110 volts from your normal sockets, so the current is higher, but is not double.
Therefore I suggest you purchase at least a 300 watt transformer.