This .45 frame will work:
As far as boards go, the only one available retail that's Angel-specific is the Virtue. 7th Element is working on a replacement board for the older Angels as well - we're hoping for something by the end of the year there. A lot of people are dropping PMR boards into their Angels due to the relative ease of installation and the low cost. Example here: http://www.pbnation.com/showthread.p...ight=pmr+board
That might be worth looking into since the Virtue board is going to cost you almost the amount the gun is worth.