hi and welcome to xmodding
washers will only get you so far without causing issues , for easy rims get some mini-z awd ones then just sand an extra flat on your xmod shafts.
gen1 awd will be hard to find ....and when you do will be costly , one way would be to buy the component parts in gpm aluminium ,chances are you will upgrade to this at some point anyway so may as well do it now
ok so onto chargers - if you are bashing around go to your local rs or doller shop get some 1000mah batteries and use the charger that comes with them
if you are getting into racing the a variable charge rate will be needed ...you carnt do better than a maha wizard one