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Different types are more or less porous and/or prone to cracking, depending on the make up, veining, etc. That's about the limit of my knowledge though. 2.5m is pretty long - if one of those would have a sink cut out, you could consider a full-depth sink, so you only need 2*1 m bits that side instead. Or have a trim piece at the back of a normal Belfast sink. That's how we worked it around ours, as the sink cutout broke when it was originally removed.
gonna need 2, 2.5 x 0.5m slabs (guestimate) - we've been sniffing around various reclamation yards but finding matching bits that aren't fucked is proving challenging. is granite much of a muchness?