the only reason like i mention to take fulcrum for myself is because i know that i will have backing in case my wheel goes kaput...  not for any value or performance reasons... for you... the factors might be varyingly different...
depends on what you want... do you want low profile or slightly aero wheels?

Racing 5 and 7 are low profile wheels with only 24mm rim height, considered a different lineup to the quattro... while the racing quattro is fulcrum's try at alloy aero clinchers...and they are 35mm in height which is very hard to produce rims of such height and quite unheard off..

looking at on the sheet performance (i haven't ridden the quattros yet, but i owned before a set of 1st gen R7s) it could possibly be a stiffer wheel than either R5 or R7 due to bulkier rim...and at 1700 grams.. they are surprisingly lighter than the R5 too...

Quattros have 4 spokes less on the front wheel than the R5 and similar 21 spokes at the rear... this part baffles me as i am not sure how they saved the weight using a rim with more mass... i didn't really taken note to see if the quattro is using exactly the same hub as R5... but it does give some features like anti spoke rotation which is not on the R5 but the higher end model R3 2-way fit....

aesthetically.. i think the quattro is much fancier as well as you can clearly see the branding more with a taller rim... and the white "fulcrum" lettering looks good when the wheel is spinning... i am a sucker for spinning white letterings...

price wise.. i think the quattro is roughly around the range of R5 pricing at RM1.1k... the R7 is around RM700.. which is cheaper, but also a heavier set of wheels...

i guess your choice if you can afford is either the R5 or quattro.. and the R5 being a more expensive model if i am not wrong despite the quattro looking to beat it on paper... this in effect makes the quattro quite a worthy purchase....

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Added on August 7, 2012, 10:58 pmi got a shock of my life.. wanscycle is selling the quattro at RM880 and R5 at RM710...DANG

racing quattro
http://www.wanscycle.com/web/node/634

racing 5
http://www.wanscycle.com/web/node/609