Yes I did run zero-sixty front and rear on standard pads and there was a deffinate inprovement in bite and feel, be careful not to put to hard a compound pad as they need heat to work effectively so can be a bit dodgy on the road if enough heat isn't built up. I ran some mintex pads a few years ago and they were lethal on cold mornings, had a few heart stoppers 
....Hence proving how important it is to get it right and match pad to disc appropriately.
Hmmmm. Strictly staying with conventional iron discs, and not ceramic or composite brakes, then discs are much of a much-ness. They are all made of cast iron, irrespective of weather they may be "Black diamond" or whatever. Therefore, if you keep identical disc sizes, different makes of disc (of the same size) will not give any improvement. The only real disc improvement is drilling, as this can hugely reduce brake fade. However, if you have never had brake fade, then drilled discs wont be of help. A potential problem with many of the cheaper aftermarket drilled discs, is that the drilled holes are not chamfered, and can crack from the holes.
Different pads, though, even with OEM discs can provide notable improvements - though if you do suffer from brake fade, then drilled and/or larger discs would be strongly recommended.
Best to get some expert advice rather than trial n error! It's simply not worth risking your (and others) safety over saving money on brakes.
I agree that advice is always a good idea, however, some of the so-called "specialists", such as BBT and DT really should not be relied on as the last word.
T_T may know what's best, I reckon. Though if I recall correctly, he may not have agreed with AP Racing's use of Dot 5.1 fluid for road use.
I think I previously stated (though it probably got lost when the forum went down) that virtually all DOT5.1 fluids are snake oil, and are completely un-necessary on a road car. Furthermore, from model year 2008, ANY brake fluid which does not meet VW 501.14 spec will invalidate the VW warranty.
Lets take the specific AP Racing 5.1 - it has a wet boiling point of 187°C, whereas the genuine VW brake fluid has a wet boiling point of 172°C - so not much difference. Furthermore, the VW fluid is a specific "low viscosity" brake fluid, for use in ABS and ESP systems. The AP 5.1 is not, therefore will make the ABS/ESP slower reacting. Both the AP 5.1 and the genuine VW fluids have a normal service life of two years, but the real killer is the cost. AP 5.1 costs about £40 per litre, whereas the VW stuff retails for £7 per litre, with 10-15% discount just for asking.
