I have a 3GS at 3.1.2 firmware, Bootloader is 6.4 and BB is 05.11.07. Bootrom is 359.3.2 (new bootrom). I have 3.1.3 blobs saved. Phone is unlocked but never JB. I know I can JB via Jailbreakme at my current firmware but am pondering if I am missing some niceities or advantages if I update. I have read 4.1 is not JB'able on a 3GS but 4.0 is JB'able. Is there any better features in the higher updates that would warrant JBing there?? Advice required on the best method to JB or best update for JB and why.