I wanted to give a personnal feedback on my current settings, because i think it might help others to have a nice useable config.
For the record, i'm a french guy living in China for almost 2 years. I bought an I9100g thinking i was buying an I9100, but the original one has completely disappeared from china on regular Channels.
Knowing it's a chinese android, absolutely no stock presence of google services, that's why i firstly got interrested into getting root to be able to use android market and google maps. And my need for root ended there.
Some like touchwizz, some don't, personnaly, i'm happy with it, fluid, fast, efficient, enough eye candy and they are indeed usefull eye candies, even on computer i hate useless eye candies. I gave a try to the go launcher, but the need to have dedicated widget, i really got lazy, and i actually don't like the look.
Finding apps for various needs is easy as hell, basically changed my life compared to my iphone's life.
One thing that was really bugging me were the chinese software included. I can't read chinese, so completely useless and really taking ram and space for nothing. Here i saw many people talking about titanium backup to freeze apps, but it's not free and underground version is unsafe imho. I've just discovered antek app manager that works perfectly for freezing apps. I'm now around 300MB usage ram on cold start, with gallery widget, double clock widget, yahoo weather widget.
I'm around 2 days of battery life without playing games, but playing some music, surfing a little and doing some phone calls, standard usage i would say ...
So what can i add ? I'm unhappy with the stock music player, i have some glitches in the sound, still looking for a nice replacement. But that's it, that's why i don't really want to try the current custom rom/kernel, because i really don't see what it could brings more ...
I did a mistake at the beginning, installing a task manager, on gingerbread, it's a bad idea, my phone runs better without, and you can't really control apps unless you freeze them or kill the crashed apps.
I had some random results with the gps, one funny thing is the gps chip seems to activate after all other sensors gave informations, i was able to fix quite fast by cutting the network and reactivating after it fixed for accuracy.
That's about it for now