Following are my tasting notes for the wines on your list. As to prices - seem good to me.
Prunotto, Barolo, Bussia, 1996: Dark, almost impenetrable garnet, full-bodied, with mouth-coating near-sweet tannins and quite generous wood, those showing fine balance with fruits but needing time to integrate. On the nose and palate ripe blackberries, purple plums and notes of white chocolate. Destined for elegance. Best 2010-2020. Score 92. (Re-tasted 17 Apr 2006)
Prunotto, Barolo, Bussia, 1998: Elegance and complexity packed into a full bodied, well balanced wine. Look for increasing complexity as the wine develops in the glass, at first revealing plums and wild berries, later opening to show red currants, herbs and hints of anise. Best 2004 – 2014. Score 92.(Tasted 15 Apr 2002)
Corino, Barolo, 1999: A nice wine but one that stands in the shadow of the far, far more intriguing single vineyard wines (Vigneto Rocche, Vigneto Roncaglie, Vigneto Arborina, Viana Giachini). But to everything there is an "upside", for whereas those wines will not attain their peak until 2010 or later, this one is approachable and enjoyable now. Medium- to full-bodied, with soft tannins and spicy wood integrating nicely and showing appealing red and black berries, red plums and spicy overtones, all lingering nicely on the palate. Drink now-2014. Score 88. (Tasted twice with consistent notes 8 Feb 2004)
Pio Cesare, Barolo, 2003: Dark garnet towards royal purple, full-bodied with firm tannins and generous oak, those in fine balance with fruits and acidity. On the nose and palate an array of blackberry, black cherry and plum fruits, those set off nicely by the oak and generous hints of earthy-minerals. Long and generous. Best from 2010. Score 92. (Tasted 16 Feb 2008)