What about using the elf or clerical spell progression?

Maybe Sorcerers, being natural casters, have a number of spells available that is exactly their maximum number of spells for their level (while "normal" magic users can have in their books as many as they want and then they can choose which spells they want to memorize every morning) and they pick them randomly when they level up.
In exchange for this you can perhaps limit the spell "reload" time or you may allow regaining used spells even after one single night rest IF they pass Int check witha -1 penality for each spell level beyond 1.
How does it sound?

I would make it the same as wizards but with a limited spell list. Spells that throw a lot of energy around I would leave the same or make lower level for them. Spells that require any finesse would be either not on the list or higher level. Also I would not let them learn spells from books or scrolls but through practice and experimentation. In other words set a guideline and just let the DM's worry about it.

I also don't feel a desire to give them more hit points. I know they did do this but I just don't see it myself. Let them use chainmail instead and call it good.

Besides giving them a D6 is just going to get them killed. It really isn't much better than a D4 at all as they would find out when those goblins started swinging.