There is a jailbreak for 4.3, but its tethered and very glitchy, works for some, bu doesnt for others. Some apps work whilst others dont.
I would suggest just waiting, its gonna be coming out wither this weekend or the next.
Wait for an offical update from either Greenpois0n or Redsno0w.
This is what BigBoss is advising in his blog.
Quote from Big Boss
"with 4.3 comes appleās implementation of address space layout randomization (ASLR). In short, this will mess up the way mobile substrate works. You will need a new mobile substrate in order to use your favorite tweaks such as winterboard, sbsettings, bitesms, folder enhancer, etc"
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