Not Republic - the corruption and waste will wipe you out (at least in Deity - I'm less certain at Emperor). Democracy is obviously 'best', but the strategies involved in keeping an army in the field in Demo are fairly arcane and you might find it easier all round to stick with Commie, 80% Science ain't bad and if you keep your prime Science cities celebrating you enjoy representative government trade levels and hence Science output.
But ... (you might have guessed there would be one) ... for my money now is the time to switch to Fundy (immediately after capturing SoL - all spare prduction capacity prior to this devoted to Vet Spy development) - in my eyse you now have the best of all worlds - infinite cash - a horde of Vet Spies - no unhappiness - unhampered production and essentially no unit support - rest of the world folds in 20 turns tops...
Whatever you choose, good luck and keep us posted, it is always good to try a new strategy even if it proves less than optimal....
[Addendum added in edit -- don't forget to turn your Science rate down to 0% once you go Fundy - you can't match them at research with a 25% roof - so don't try - steal any needed tech and rely on the good ol' AI to scale down his research in reply to your obvious inadequacy in this area ]
Scouse Git -- firstname.lastname@example.org
"Staring at your screen in horror and disbelief when you open a saved game is one of the fun things of a succession game " - Hueij
"The Great Library must be built!"
"A short cut has to be challenging,
were it not so it would be 'the way'." - Paul Craven
[This message has been edited by Scouse Gits (edited April 27, 2001).]