Only a few colours are recognized in agouti - chestnut, chocolàte, opal, lynx, chinchilla, squirrel, frosty, orange, gold and silver tipped steel - so the chocolate, dilute and non extension genes are all good but stay away from shadeds (seals, siamese sables and sable points.)
Is 2 brokens mated a bad thing ?
Breeding two broken a will produce 25% Charlie's (rabbits with two broken genes) that are usually very high in white and not showable. There is also some evidence that Charlie's are done to digestive disorders.