Yamaha CP88:
Features:
1) 88-key Graded Hammer Standard (GHS) Keyboard.
2) Authentic sound engine derived from the Yamaha CFIIIS grand piano
3) 728 Voices, 48 Drum/SFX kits, and 480 XG Voices
4) 128-note polyphony
5) Split/Layer Mode for creating custom sounds
6) Easy-to-use intuitive panel layout
7) Onboard Library of 135 Reverb, Chorus and Master Effects
8) USB Audio/MIDI Interface
9) 2 x 1/4″ TRS audio outputs
10) Built-in Metronome
11) Stereo 1/4″ headphone output
12) Real-time control knobs and buttons
Specifications:
• Keyboard: 88 Keys Graded Hammer Standard (GHS)
• Voices: 728 Voices, 48 Drum/SFX kits, and 480 XG Voices
• Polyphony: 128-note
• Effects: 135 Reverb, Chorus, and Master Effects
• Audio Interface: USB Audio/MIDI Interface
• Outputs: 2 x 1/4″ TRS audio outputs, 1 x 1/4″ Stereo headphone output
• Metronome: Built-in Metronome
• Controls: Real-time control knobs and buttons
• Dimensions (W x D x H): 1410 mm x 436 mm x 135 mm
• Weight: 14.3 kg
Pros:
• Professional grade keys, sounds, and effects
• Intuitive layout and controls
• 128-note polyphony
• USB audio/MIDI interface
• Variety of outputs
• Built-in metronome
Cons:
• Expensive
• Heavy
• Can be difficult to set up for beginners

Compare Costs here before making any purchase:
Yamaha YC88:
Features:
• 88-key graded-hammer keyboard.
• Pro-level sounds with 128-note polyphony
• 128 voices and 16 drum kits
• Built-in DSP effects including reverb and chorus
• Advanced arpeggiator with over 200 patterns
• Dual and Split modes, song playback and recording
• USB connectivity for easy computer integration
• 2 x 1/4-inch outputs, 1 x 1/4-inch headphone output
• MIDI In/Out/Thru, USB to host
• Metronome and transpose functions
Specifications:
• Number of Keys: 88
• Keyboard action: Graded-hammer
• Key material: Ivory-feel
• Aftertouch: No
• Polyphony: 128 notes
• Number of voices: 128
• Drum kits: 16
• Effects: DSP Reverb & Chorus
• Arpeggiator: 200+ patterns
• Split/Layer: Yes
• MIDI: In/Out/Thru
• Connectivity: 1/4-inch outputs (2), 1/4-inch headphone output, USB to host, MIDI In/Out/Thru
• Power Supply: Included
• Dimensions: 53.7″ x 9.1″ x 3.2″
• Weight: 15.2 lbs
Pros:
• High-quality graded-hammer keyboard
• 128-note polyphony
• 128 voices and 16 drum kits
• Built-in DSP effects
• Advanced arpeggiator with over 200 patterns
• Dual and Split modes, song playback, and recording
• USB connectivity for easy computer integration
• MIDI In/Out/Thru
• Metronome and transpose functions
Cons:
• Expensive
