IF the Technic pack Bukkit version requires every person to have it installed in order to use it, that might be a problem. Some players don't want to mess up their MC files. This is why Spout would be better in the long run. No third party installations needed and doesn't mess up MC files.
There is one major downside to Spout: What mods?
Lemunde and I use batch stripts to run multiple copies of minecraft in individual folders. For Windows users, the code is as follows:
set APPDATA=http://forums.bethsoft.com/topic/1327097-unofficial-minecraft-thread-69/%cd%minecraft.exe
It should be able to use the command line to allocate more RAM, too. Simply place a copy of minecraft.exe in the folder you want, save the code as a .bat text file in the same folder, and run Minecraft from the .bat file. This tricks the copy of the game into thinking that it's current location is the appdata directory, so it creates a new .minecraft folder at that location, so once you log in, you will end up with a fresh install to run whatever mods or lack of mods you want. It's important that you run that particular install through the .bat file, otherwise the exe will default to the real appdata directory when run.