Something like this would be good:
1. A-side
2. B-side
3. Remix of a NEXT LEVEL song
4. Sunset or Sunrise remix
5. A-side instrumental
DVD:
A-side PV
In my opinion any more than 2 remixes and that's bad...look what happened with Rule/Sparkle. The GREEN and Days were awesome, but the Rule ones SUCKED.
Also I don't think a b-side needs an instrumental or a PV.