For my Xtreme CBZ
1. 6th Gear for relaxed crusing (I prefer even 7th gear for open highways)

2. PGM-Fi from Honda: Ofcourse I dont need to give explanation for this.
3. Full DC Electrics: Electric mods freindly
4. Projector Setup with Bi-Xenon: Better lighting abd break ego of the freaks in 4 wheelers.

5. Better brakes (Direct pick from R15 for front and rear): Xtreme's rear is no up to the mark.
6. Mobile Charger: Need this on tours.
7. Integrated GPS (Ofcourse I have Nokia 5800XM doing the job, But still!!

)
8. Monosuspension (Direct pick from R15): Way better handling
9. Sticky tires with same profile as of now on my bike (Dunlop Geo-Cruiser on rear and Michelene M45 on front)
10. Liquid cooled.
60% of requirments were satisfied by my R15 itself which I need on my Xtreme.