Probably the old pattern TA if you want a chainring which works perfectly well for not much money. If you want black, TA Full Track is nice but pricey. Stronglight and Goldtec are decent but anodised after tooth cutting, which means they are dirty. Shimano and Sugino are good quality but neither company seems interested in your business if their pricing is any indication. Campag are good too but don't justify being twice the price of the old pattern TA. Gebhardt are well made but only really worth considering if you want a size outside the normal range.
Probably the old pattern TA if you want a chainring which works perfectly well for not much money. If you want black, TA Full Track is nice but pricey. Stronglight and Goldtec are decent but anodised after tooth cutting, which means they are dirty. Shimano and Sugino are good quality but neither company seems interested in your business if their pricing is any indication. Campag are good too but don't justify being twice the price of the old pattern TA. Gebhardt are well made but only really worth considering if you want a size outside the normal range.