This is a quite good article at expanding the simplified Wealth rules presented in SWADE, still making it "light" enough for the Fast! Furious! Fun! philosophy of Savage Worlds. I really like the concept of "savings" too, as it gives players something to "bank" for a big-ticket item later.
My only gripe - this is a minor one - is tying dollar amounts to a game statistic, especially in modern settings. In Fantasy or SciFi settings, the economy and the purchasing power of a Gold Coin or Intergalactic Credit is largely in the GM's hands, so that's not much of an issue. But $100 in 1891 buys you a lot more than $100 in 1991, and in turn $100 will get you even less today. But that's something any modern-era game suffers from.