Assuming of course I was planning on getting every song, but I see your point. Also, if you have $200:
Basically the PS3 one with new colors. Doubt anybody will shell out that much for a controller... But the three-tier fret buttons will be standard, mark my words. Perhaps with gameplay bonuses for playing the right fret area, or maybe an Expert+ Guitar mode where you have to play in the right tier. Just some thoughts. I'll share more in the old thread from way back.