These are the two props Ive been running on my prototype KEP's T2-44 rigger during the 2013 season. The one I have like the best is the 1657 (but in 2013 we have not developed the props & engine combo at all). All of my props are done by Mark Sholund @ Props-4-U -> Link.
Octura 1657 / Profiled / 56 dia / 4.09" C.O.B. Picth / 4.29" T.E. Cup