Let me start by saying this...I've been gaming for nearly 25 years, and I've played A LOT! I have seen this industry go from just a few options to thousands.
That being said, I know that no single game can do everything, no matter what they claim or the thousands of support books they release. BUT (you knew there was a but in there, didn't you?), I believe that the Pazio gang has done a damn good job remaking the granddaddy into a fun and exciting product.
Now, being as long in the tooth as I am as a gamer, I must agree that I am a bit board with the base classes. I love the reworks, and I can't wait to see what mid and high level games are gonna look like, but I feel that the new soeceer blood lines is truely a thing of beauty, replacing several of the 3.5 classes like Dragon Shaman and the Favored Soul, but I must concede to the game could use a few more options.
Classes like the Dusk Blade, Battle Mage and the Scout would be a sweet addition to the game, be it stand alone classes or as variations. Scout as a variation Ranger, Battle Mage for Wizard and so on. I have been playing around with the Beta rules to convert a character from our current game into Pathfinder, he is a Dusk Blade and it's been interesting, to say the least. I would love to see a Player's Handbook II released (as I hope they will!), with new classes, spell, feats, ect.
It would be interesting to see the fans (us) and the Pazio gang working together on this project, say a submission contest or some such for the new classes, with the best that Pazio approves of going into a Companion guide or something. This could allow the established 'other classes' to get a make over and for new classes to be created, like the non Lawful Good Paladin idea someone had suggested.
The kit idea also has merit, and might make an interesting path to follow within the game system as well, but in some cases they might be like the Prestige Classes. The Battle Mage would be easy to do, but how would you do a Dusk Blade? Would you make it a base Wizard/Sorceer, and just lay down the changes at first level? It could be argued that you would need to start as a Wizard/Sorceer, and then take a level of Fighter before you could become a Dusk Blade. Do you see how this could become complicated?
And, on the idea of Prestige Classes, are we going to see more of them? I like the changes made to some of them, and it would be interesting to see some of the 3.0 and 3.5's get a make over for this system. Couldn't we make the 'other classes' into Prestige's instead? Think about it, the Battle Mage would be a sweet Prestige Class, and the Scout would be a nasty one as well! There would be one limit it would place on the Prestige Classes though, make them 5 levels only, and make it so that they are level specific for the new level. For example, you could take the first level once you met the base requirements, say +6 to hit base, +6 in Concentration, and the other requirements. Upon your next level, you go back to your base class and earn or gather the next set of requirements, be they feats, skill ranks, or so on. This would make the Prestige Classes more interesting because you could be a level 1 whatever for a long time, and they you could make the next level in it all that more sweet because of the Peer recognition and the deeds you performed to get there, think 1st ED Monk or Druid in this case as an example.
I know I got off topic a bit, by my hands got away from me. I look forward to any input.
Fight hard and roll high!