Best shocks for a stock TJ?

X2 to the Rancho RS5000x. I'd replace all four at once, not just the fronts. The rears are easy too, you don't need to jack the Jeep up to replace them. Just give the rear shock's upper bolts 3-4 days of spraying them with Liquid Wrench, Kroil, or Break-Free. Don't waste your $$$ or time spraying the bolts with PB-Blaster or WD-40, neither of which are effective at loosening hardware that might be seized from corrosion from salt on the roads.
 
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The Rancho 5000X is popular in this forum, and is a good bang for your buck. There are also a few threads on here that compare the Black Max shocks and put them in basically the same category of ride quality and budget, so you could consider those too. But I’d just go find those threads; there is a lot there not worth repeating here.

Also, @fuse has a great walk-through with pics if it’s your first time replacing shocks.