If u root . . . u lose all Samsung features on the phone
This is untrue. If you root and install a plain Android ROM like CM10, then you lose the Samsung features. That's the point of those ROMs.
If you root and install a TouchWiz-based ROM like Cleanrom or Synergy, you still have most or all of the Samsung features that some people like.
OP, remember that rooting doesn't mean that you have a new operating system. It's just the first step. The second is to unlock your boot loader. The final step is to install a custom ROM.
If you root but leave the stock OS running, it's likely that you will get an OTA update sent to your phone. At best you will lose root. At worst it will brick your phone. To keep that from happening, you will need to install something like the custom ROMs I mentioned. Again, some of which have the Samsung overlays/enhancements to ICS or JB.
Sent from a Jelly Bean flavored SCH-I535