Heated Grips - YES
Engine Bars - Hepco & Becker, BMW no good.
Cylinder guards - Got them as well as the bars, but maybe no needed, not an option with BMW bars.
Wheels: Alloy easier to clean, look better (IMHO), no good for *serious* offroad?
Can: Remus seems to be the default can - just bought one myself
Topbox: I've got BMW topbox - again good piece of kit (IMHO). Going for the BMW panniers as well, didn't like the look of the permanent frames of zega and don't intend doing off road with panniers. Going to use bags to aid loading / unloading.
Tankbag: didn't like the BMW one. Mine actually came with one and I had it removed. Will fit baglux system eventually.
Lights: Dipped beam looks ok, but haven't had extensive use of main beam so cannot comment.
Alarm: Don't bother with BMW, go with aftermarket like Datatool or the like.