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just found this from our resident GT guro GM, which i found on another site so i hope he doesnt mind me posting here, but he says and i quote
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I think the 26.8 or 27.0 for a 1994 depends upon the month it was manufactured. There may have been a seat tube running change in production. I have had both in complete bikes that had all there original parts. If the 27.0 goes in way snug to the point that it's marring the post I'd definitely go 26.8 as long as it will stay tight and not swivel.
so its a case of suck it and see, it also seems when the question is asked three different people will give you 26.8 ,27.0 and 27.2,