If you're wanting sampling, good acoustic sounds, good drums, ect. I'd suggest you go with a synth such as:

Yamaha Motif (original) or ES
Korg Triton (Extreme) or Le
Roland Fantom

All these models come in an 88 weighted key version.

Good Luck,
Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.