So there's several factors at play here- producer style and vintage in particular.
As to latter, I'd say 2000 and 1997 are the likeliest to show well young.
While style-wise I prefer more traditional producers, the best for your purposes are probably the "in-betweeners"- not as hard in their youth as the traditional long-maceration etc guys, not as oaky as the Sandrones (the real new wavers are way over your price level anyway). In addition t Batasiolo and the Ceretto Zonchero that Ed mentioned, you could try Chiarlo or Ca'Rome. I prefer some more traditional makers
-Marcarini in particular makes excellent Barolo for less than $50 for both the La Serra and the Brunate. Einaudi's basic bottling is also usually good.
Staying within Piedmont royalty, Barbaresco has a similar profile to Barolo but is usually a little friendlier in its youth. The de Forville and Produttori del Barbaresco normales are usually pretty inexpensive- maybe $28-30 and $22-25 respectively.
First of all, I'm going to expand your critieria to Barolo AND Barbaresco an