Why are you installing a CHT? It's not really necessary unless you are expecting crazy high head temperatures. Just keep the coolant under control.
If you are expecting big barometric pressure changes, especially on a high strung NA, then yes i would recommend a second sensor for baro correction. The map daddy upgrade is easy to install but just about any 5v sensor will work.
What manifold are you using? My personal suggestion would be to go with a MAF. Bosch HFM5 are great sensors. This will compensate for Baro and IAT and should work better in high lift cam scenarios where you don't have very good idle vaccum.
I like your suggestion to use the Bosch HFM 5 MAF. I spent today trying to buy one. Autozone and ORielly's were no help because if you can't tell them what car it's off of, they can't "replace" it. They have no concept of using a part like this on a Datsun Z as they never came with it. Summit was better. They made a valiant effort to find one. But they also don't really go by HFM5.
Any idea what cars they were used on? My wife's BMW seems to have one that looks suspiciously like it, but she gave me stink eye when I tried to find the part number...