A 3" barrel on a medium frame would make a perfect CCW in my opinion.But what about a 4"? There seems to be a lot of 4" police trade-ins [-$200!] but I haven't seen any with 3" barrels.Is the 4" much harder to conceal/carry? What type of holster works best? My current carry is a 2" Taurus but I feel the need to "up grade" to something bigger.