I love this one as a replacement toggle because it can be customized:
It has a toggle for 2g/3g and 4g. What's weird is, it doesn't let me choose the 4G togle.
-EDIT- I guess the 4G toggle was only made for the EVO, so I've emailed the developer. Hopefully, he can make it happen for all 4G devices, not just the EVO.