how rev happy an engine is has nothing to do with the displacement... its a function of the borexstroke ratio...and to a lessser extent the cam profiles...how reliably it does it comes down to how strong it is. generally a short stroke motor will be more 'rev happy' than a long stroke motor - but it will sacrifice this for torque....
thus the true answer to the question is go and do some research on the bore stroke of all those engines and then look at where on the rev scale they make peak torque and power and also what the rev limiter is set at......
and r32line - the reason for the difference between the 4cyl 2 litre and the 6cyl 2 litre is generally because they have spread the capacity of 2 litres across 6 pistons - and chosen to keep the stroke short - compared to the 4cyl its (prob) a very different borexstrok ratio...
ps ... also changing the gearing ratio will effect things allot.... an old trick is to drop in a shorter ratio box, while you lose some top spead you have better acceleration and a somewhat 'revier' car to drive