Graham,
Don't want to de-rail this thread but most people seem to think an 8.5 is going to be too slow, I don't know many people who have them. However I completely agree that (especially with Lipo) they can be a really usefull smooth motor. If you can't get one 2nd hand and decide to buy new I can recomend the Novak one which I've used in most of the Worksop rounds this year in 2wd and not exactly been off the pace.
If you get a 7.5 then consider a bit of negative throttle curve over what you usally use.
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