Its a personal choice I guess, and like mentioned previously.... which one would you enjoy most and stick to in the long run?
Later this year we are going to buy another piece of equipment and it would also be the same 2 choices. Will probably go with the rower ourselves (Concept II, as Beetle mentioned). Hubby used to row for Surf Lifesaving.
The one you're looking at sounds great.
Good luck and let us know what you decide upon.