I know there's a lot of info out there, but a lot of it is based on opinion, and some info I've read even conflicts. I am interested in jailbreaking for 3 things only, as I'm pretty much very pleased with everything else with my Iphone. I want a better notification system, the ability to use my Iphone for wireless tether/wifi hotspot for free, and the ability to use my own short tones as sms and email alerts. Thats all I want, no themes, etc. What I'm asking for are your recommendations, and also, do you know if doing these things have resulted in a decrease in battery life, and/or stability issues/crashing, etc?