I carried a kershaw leek for a long time before picking up a (now discontinued) RAAM. After that it was like an arms race of bigger blades. I haven't gone too crazy. Most of my biggest blades are in the ~3.5 range. My recent pickups include the Kershaw knockout and spyderco manix 2. Both are lightweight but still have a nicely sized blade. I think i'm settling into the 3.25 size as just about perfect for my needs. Big enough to get the job done, but not so big as to be too heavy/bulky and doesn't risk unwanted attention. Also seem to fit (or be close fitting) the legal limit in most places i go. So what is your ideal blade length?