For cheap - Monroe Blue.
Better valving and less cheap - Monroe Black.
Even better shock than Monroe - KYB
Even better shock than KYB - Bilstein
Even better shock than Bilstein - Koni
Shocks don't hold a vehicle up, so it really won't matter which one you get for load capacity. How well it deals with carrying that load will depend on valving. Good valving comes with a price. I run Monroe blues in mine.