R32's (and R32 engined R31's) have all gone pretty well, love the way they rev, its peaky, but you do suffer at lower revs.
whereas a stock engined R33 comes onto boost so quickly you hardly notice it, full boost under 3000, its extremely linear.. but it doesnt rev as high.
modified, the 25 will really start to show its colors.
so, go for the best of both worlds;
an R32 with an RB25?