I think with Benson on the bench, you're deep enough to make this work. B-Marsh is also in line for a good year (13 targets tied Roddy White for most in wk 1), as long as Henne stays healthy and plays as well as he did vs NE.
Rice, DMC, Mega, Marsh >> Rice, DMC, Vjax, Marsh ... unless you start 3 RBs and even then, Ced Ben has proven to be more consistent and less injury prone than Wells.
2013 12-team H2H .5 PPR league; 1 QB, 1 RB, 2 WRs, 1 Flex, 1 TE, 1 DST, 1 K:
QB: RGIII, Schaub
RB: A. Peterson, D. Williams, D. Wilson, J. Bell
WR: J. Jones, H. Nicks, C. Shorts, M. Williams
TE: J. Graham, M. Bennett