Yeah, grail time again already! This one just slips into grail category for me, making it because of the great colour preservation on the box and the mint-ness/working electronics!
Yup, fully working MIB Omega Supreme (missing 1 smallest leg clip). The box is huge (ironhide box in the one pic for size comp.) and is very vibrant but has the tear on the bottom left. The figure is in very mint condition, stickers applied but new looking and his full electronics (light, wheels, spinning head, raising head gun) are preserved! I had my own junky Omega (no clips, acid corrosion, a couple of broken track clips) in my collection already but this one is great (for $150)!
Not sure what tops my list. Certainly my first TF - Soundwave - is up there, even in its subpar condition.
Another one would be 2 consecutive artist boards from the Marvel US Comic (#65 and #71, each of the 4 pages signed by Senior & Wildman). There can't be more than one of those around. :-) I'm glad I grabbed them way back at that Botcon.