I think that Boker Edit's a nice knife for its size & 440C's a decent SS. The Ranger Little Bird is a stout, short FB, but it's small. Mine's 4" OAL with about a 1.75" blade & it's thick, but the handle's pretty short.
I can't comment on the Izula as I don't have one yet, but I've had a few BK11s & they aren't bad. I really like the blade shape & size, but the handle shape could be better. I have large hands & can't get my hand "comfortable" on the handle because of the "wire" breaker. If my hands were smaller, it'd be a great knife. Based soley on observation, the Izula looks like it'd be more comfortable in the hand.
Another great small knife, but more expensive, I believe, are Newt Livesay's little knives. I've had a couple of them (I think one in A2), plus an Executive Woo & those aren't bad knives, either.
But I'd have to say, for the most "bang for the buck", it's hard to beat those 2 Bokers, especially the Edit.