A 4" L or K frame seems like a very average and a very good revolver size. Nothing wrong with the beretta, either. .380 is getting more affordable as time goes on.
Top: Smith and Wesson 586, Bottom: Beretta 84 BB. Picked both of these up recently, gotta love blue and wood.
Can't go wrong with a 4" Smith, that's for sure. I love my 19-3, has just the right balance and feel to it.
I don't understand why you would consider a 586 anything other than "full size". It's dimensionally larger than their most popular frame size ever - the K frame