1-100 is the best bet IMO.
You then get course grain banding :- 100-90 Outstanding, 80-90 Excellent, 80-70 Good, etc etc.
While still allowing for fine grain scoring, when wanting to compare competitors within the same 'band'.
I see someone is paying attention. Welcome to PC Gamer meets the 4K contest.
If you want to share the love abit, you can always add several 'Special' Awards, Most Playable, Best Technology, Best Graphics etc etc
These could be awarded via round based nominations.
I've been considering the same thing. However, I think the judges should come up with an award they want to give, then come to a consensus among themselves on awarding it. Voting for the award may result in unintended effects. These sorts of awards are really just cosolation prizes of sorts that reviewers/judges tend to award when they want to recognize special achievements in a particular area. So a consensus is really better than a vote, since the ratings would already have chosen which game was "best".