Fliteware Logbook2
I also tried a few out and eventually opted for Fliteware Logbook2. You can set the field lengths which makes the cursor jump to the next field if, say, you enter an airfield in IATA format rather than ICAO. Data entry speed is important to me and it also had all the features of the other progs I tried. It has import capability for certain file types and gives a JAR layout but not sure if identical to Jepp paper logbook.
Nearly all of them offer a trial, so experiment and try to give them all a shot. Ultimately it's a personal thing so take your time. The pilots I fly with have a large and varied array of electronic logbooks. I haven't seen a decent free logbook.
The last thing you want is to start one then later decide you really prefer another.