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In fact I don't mind GXP in practice, although I consider it to be a good way to burn through multiple BB bearings in a short timeframe.
That said, I've been offered a chance to get hold of a 105 hydro groupset at a good price so will likely be going with that.
I need a solution for the cranks, however, as the groupset available to me uses 170mm cranks but I prefer 165, so I may just use a sram chainset from my parts store. If I'm totally honest, mismatching components in a way that slightly ruffles the feathers of purists is appealing for some reason :)
Are you sure you want to put rival on this (so you have to use gxp bb's)?