I bought a JAR logbook from the Transair catalogue, and transferred my military and everything else running totals across. It takes a long time & much head scratching to go back through all your old flights and come up with sensible figures for the slightly different columns, as P1, P2, captain, copilot, PIC, PIC u/s, Dual all have slightly different definitions depending on what rules you were under at the time. eg I have many hours which were P2 captain under Army rules in those days, which simply doesnt compute in civvy terms) (My first log book - RAF-style (From the army) is different from my Navy logbook, which is different from my civvy one - creative maths required!)
Make sure you get one with columns for simulator flying in the main section - much more important these days than it used to be. I find the Transair one good, because it also records instructor time. (No column for NVG though!)