Here are some that I have used in the past. I prefer VCCV personally so those are the ones I usually use:
AICA (has a bit of a british (?) accent, but is relatively easy to use and cute)
Ami Taiyo (found her cuz someone said she sounds a lot like GUMI english, and I kinda agree)
Anna Nyui "DIVA" (pretty good quality and range)
Juni Ginkuro "Soft" (has a really good sound and one of my favorite soft-sounding english VBs. They also have a stronger sounding VB called "bright")
Kumi Hitsune (A bit wonky if you only use the VCCV phonemizer without changing anything here and there, but relatively easy to use)
Shiki Sakasa "Alycon" (Also a bit wonky with phonemizert. Really powerful and cool imo)
Yami Ryone (My favorite english voicebank, so I have used it a lot. Sometimes needs a bit of tweaking)
Have also used Milk (An arpasing VB that has 4 different voice expressions , normal, falsetto, power and whisper which helps making them more expressive. If you're unsure about how voice colors work I can show you how to set it up)
Hope this helps ~