Big names flying around I have just been offered RG3 + Cruz for my McCoy + Mendenhall

This is a keep 4 league at their draft possition

McCoy - 1st
Mendenhall - 9th

Cruz - 3rd
RG3- 8th

My current team

QB [1]: Flacco/Schaub
RB [2]: McCoy, Matthews, Spiller, Martin
WR [3]: A. Johnson, S.Johnson, Blackman, Britt, S. Rice
TE [1]: Finley
Flex [1]

Also offered to me by the same guy..
Spiller for Cruz
McCoy for RG3 (extremely laughable)
Matthews and Martin for Cruz and RG3

Should I take any of these.. the first deal will definitely help my team but I'm giving up a lot in terms of keepers and giving up my best player (well spiller might be my best now)