I think both should be held until their 10th birthdays if possible, as pdm indicates. If you buy a bottle or two to try, do drink them over a couple of hours, as they can change quite a bit.
If you hunt around, you can get aged bottles for reasonable prices. I've bought '99 La Fornace for $19.99 and '93 Tenuta La Fuga Riserva for $39. But those are far and away the best bargains I've found for good normale and riserva level Brunello after lots of looking.
Hunter is right... They don't come cheap - especially the best examples.