For a lift jack, Arcan. Yes, it weighs nearly 100 lbs but for the money, it's hard to beat and close to bulletproof. I also work in gravel and sandy soil a lot so a good sheet of 3/4"x2'x2' plywood does the trick for jacking.
For jack stands, I currently use Torin but as expected, they tend to sink in the sandy soil. However, I have had my eye on these:
Hein-Werner Jack Stands — 3-Ton Capacity, 2-Pk., Model# HW93503 | Jack Stands| Northern Tool + Equipment They have a small tab enclosing the bottom of the leg to slow down the "sinking". Made in the U.S.A. to boot. These are nice but twice the price:
ESCO Jack Stand — 3-Ton Capacity, Model# 10498 | Jack Stands| Northern Tool + Equipment