"MCP is a very good idea but not the latest version as it is very buggy. Prefer to install the Aminet version or at least an early version from the MCP website."
Yep, I like older versions too. 1.32 in use here. And there's only certain patches which may cause problems. Like with OS3.9. But don't blame whole program for those, you can disable non-working patches
"Executive is good, specially if you tend to run many programs at the same time. If you don't, it's better not to install it."
...unless if you want make fancy dashboards etc

"HappyEnv is highly suggested. Read the manual and try it!"
I used this earlier, but at the time it had some bugs, don't know if it's updated after it. env-handler is similar to it and works fine here.
"Imho, and as SuperTurbo said. PowerIcons, birdie, VisualPrefs and the rest of the eye-candies is a wonderful way to waste system resources. (Mainly memory and CPU cycles)"
But if you have enough memory (I have 128M) and fast cpu (I have overclocked 060) then those are acceptable for prettyness
