Suggested settings for a Sony Bravia

Just a few days ago I bought myself a 32" Sony Bravia. Model Number: KDL32L4000. The tv outputs in 720p and is perfect for gaming on my ps3. I use a Monster HDMI cable and have just a few questions. I upgraded from a Toshiba 26" crt hdtv and with getting into the lcd stage I'm unfamiliar with the settings etc. My biggest concern right now is the backlight setting. The tv is in my bedroom which is always pretty dark and although I've researched a lot about the backlight settings and a lot of people say to have it the lowest it can go to lengthen the lifespan of my television, I just find the image uninjoyable that way and a lot better when it's turned up. Could someone give me some insight on this and maybe if you have the same tv as me throw out some setting options and numbers to help me decide what's best for my tv. Thanks in advance