I installed a HyperPro spring and a 3/8" thick preload spacer made from a cutting board.
This got the suspension in the right place, but damping is still a bit inadequate. It's not nearly as bad as I had feared, though, and the spring alone was a vast, affordable improvement -- $125 vs. $450+ for a Sasquatch rebuild.
I'm still planning to save up some pennies and ship it off to Sasquatch at some point next winter to get it done right. I could also use a higher rate spring, but it's a lot better than stock.
The Hyperpro spring is great, but you should be aware that the US distributor, Annitori, has a firm policy of taking customers' money and lying to them at every opportunity. It took five weeks of unpleasantness to receive my supposedly "in stock" spring, and they openly lied to me about it at every opportunity. At first, I thought my experience was a fluke, but if you poke around it turns out this is pretty much the typical way they do business.
Whatever you do, buy your spring somewhere else. Do not call, email, or do business with Annitori -- they will happily lie to you in order to get your money (they're very good at telling detailed stories, too -- excuses as an art form). And once they have your money, they suddenly lose all interest in shipping the product you paid for.