I have this bit, http://www.toolstoday.com/p-5606-cnc-v-groove-router-bits.aspx. I bought the middle sized one to make the 90% angle cut for making attachments to my MFT that fit into the top groove of the side extrusions. It is a beast of a bit and I would not use it in a light weight router. I only use it in my router table.
Those Amana bits are nice but $162 price tag may not be what you're looking for. Whiteside makes very good router bits and since you are using a guide a regular chamfer bit seems like it work.