The best replacement for torsion bars is coil springs.

The best alternatives to torsion bars are rated as following:
★★★★★  coil springs
★★★  leveling kit
★★  leaf springs
★★  springs

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Speaking about torsion bars, one probably shouldn't forget about airbags.

Other search terms related to torsion bars and their ratings are:
★★★★★ airbags
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torsion bars
coil springs
leveling kit