Help me pimp my brakes - brake upgrade (calipers / pads)

All nearly the same (Shimano Dual Pivot callipers).
I think it may be more wise to invest in other components, as there is nothing wrong with Sora callipers.

Cheers, I read this when looking at DA calipers "Must be used in conjunction with ST7900 STI or BLTT79 aero levers for correct leverage ratio" and assumed otherwise

Cable pull shouldn't be an issue.

Brake blokes are a sensible upgrade before going for new calipers - Swiss Stop green are superb, they make a noticeable difference to brake performance.

quoted for posterity - gave me the image of employing a couple of painted chaps from Zurich to jump into the road and halt my progress!

cheers though, Dammit also recommended these. I just didn't know whether a set of calipers for £20 more than the blocks would provide more of an improvement than the block alone.