If it's any help, here's the list of Celica/Supra boxes in increasing order of desirability:
1. T50 (early alloy case)
2. W50 (steel case)
3. W55/W57/W58 (alloy case Celica/early Supra box)
4. W58 (later model Supra box, as above but with steel sandwich plate)
5. R154 (Supra turbo)
6. V160 (Supra 6-speed)
HTH
1. T50 (early alloy case)
2. W50 (steel case)
3. W55/W57/W58 (alloy case Celica/early Supra box)
4. W58 (later model Supra box, as above but with steel sandwich plate)
5. R154 (Supra turbo)
6. V160 (Supra 6-speed)
HTH

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