Lanceair IV fourty size racer?
That is pretty fast for a full scale but scaled down I don't think it would be all that fast as you would like it to be.
Another plane you may want to look at if you don't want to go with whiplash or F-20 may be a Diamond Dust or even a Scat Cat.
I have a Diamond Dust as of now and it is the fastest plane I flown and owned. I had a Scat Cat a few months ago and it too was a pretty fast plane. It all ended when I flew it through a tree but was a very fun and easy plane to fly.