I don't think you can delete Stock Browser. Why on earth would you wanna do that anyway!
There are a lot of kernels floating around. Chainfire, Ninphetamine, SpeedMod, Lulz, Hellcat's etc. Personally I liked the CF kernel as it was very close to Stock and yet it had root. However, I switched to Ninpho for BLN, but I'd like to move back to CF if I get that support, don't know why, I don't like this Ninpho kernel.