Cubase SX3 Instruments

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A1 - Polyphonic Synthesizer

Embracer - Motion Pads with Surround Support

LM-7 - Virtual Drum Machine

Monologue - Monophonic synthesizer

VB-1 - Virtual Bass

Ok, I know that it doesn't come with Cubase SX, but I like these other items that Steinberg used to sell before Waldorf went bankrupt.

Waldorf Attack - Virtual Analog Drums

Waldorf PPG Wave 2 - Virtual PPG Wave Synthesizer

Additional Steinberg Virtual Instruments

Groove Agent - Virtual Drummer

Halion 3 - Soft Sampler (actually, sample player)