Everyone who leveled out should make 29 twinks. That way you can have some fun without sacrificing having a level 60, or your sanity if you leveled two chars past 45. It also takes maybe a day and a half played to have a fully functional 29. The real exp curve happens around 35.
Also has the benefit of having a pretty balanced layout of classes and not completely enchant driven like 19, or overpriced item driven like 39. If anyone played from vanilla release to tbc they probably remember the 15v15 pure twink 29 ABs and WSGs before xserver. Bring it back imo.