I couldn't wish for a nicer/better etc ... (also the nicest/best etc ... I could have wished for)GOOD/EXCELLENT used to emphasize that you are very happy with what you have and cannot imagine anyone or anything better 我不能再奢求更好的…;我想要的最好的… I couldn’t wish for a better husband. 我不能再奢求比他更好的丈夫了。
It’s the best birthday present I could have wished for. 这是我想要的最好的生日礼物。
→ I couldn’t wish for a nicer/better etc ... at wish1(1)