If you get an FG, right not, they can be had fo like $1050 USD for a base MT. You can get teh Kamitiro chain 4WD upgrade for any FG
http://www.rcuniverse.com/forum/m_8130285/tm.htm
I think that upgrade is like $400, I cannot ermember the conversion from Euros to USD.
The total would be about just under $1500 for FG and teh 4WD upgrade.
The MCD is already 4WD shaft, but I think it is $1500 USD for the rollewr only (no engine). I haee to look again, they might now include an engine.