Not that it matters greatly, but the concept of two of the current magi rely heavily on Rego. Jonathan's Praxiteles is a Rego Craft artist, while my Petronius is a teleportation/portals researcher. Whether that figures into your choice is up to you. 
A few guidelines that Jonathan gave us on the build points:
- We get 210 build points for covenant resources, plus 50 points for personal resources
- Vis sources cannot be purchased with personal build points (there's a virtue for that)
- Vis stocks should not be selected, some stocks will be factored in based on the sources. Vis stocks are just too cheap, or sources are too expensive.
- Don't use build points for specialists. Design them from the ground up, make them more complete than stats of their most useful numbers.
- We have a shared lab where the aura is stronger. Anyone can purchase virtues for that lab using covenant build points. Virtues for your own ab can be purchased using personal build points only.
I would also note that under RAW build points, tractatus are not very cost-effective compared to summae.
Here's a list what already been purchased.