take his offer and save your money. just because you broke now, doesn't mean it will happen again anytime soon. there are lots of D35s in this club that are abused weekly with a lot more than 33s on them and last quite a while. just gotta know their limits and keep wheel spin / hop to a minimum.
personally, for a DD with max 33s i would look at swapping in a 8.25 before any other diff. cheap, simple and reliable and the aftermarket is good enough for 33s.