upgrade transport or amps..advice please

In system consisting of mirage OM 6s, proceed AVP2, 5 marantz ma 500s,arcam alpha 8 cd player(used as transport) and pioneer elite 47 A (with TMC cabling) what would make the more significant difference to 2 channel music experience....upgrade of left and right Amps(budget max $1500-$2000 us ) or a levinson 37 transport which I could acquire for $2000 US in mint condition..if amps please give suggestions.... thanks for your thoughts