Siphon type blasters are very generic and it's easy enough to upgrade just the gun.
If the hopper is still good (a glorified bucket), there are at least a couple quality companies that sell complete guns. A higher quality gun will make a difference on how often the compressor runs or how much work is done for the same compressor cycle. Higher quality means higher efficiency.
A name brand gun will have
parts support, unlike the generic type products. That Craftsman blaster is a disposable type of product, but you can upgrade it. That's what I do with my budget priced blasting equipment, upgrade the
parts as they break, wear out, or are no longer supported.
I don't know of any companies off-hand that I've purchased from but they should be easy enough to find. No Ebay or Amazon search, just an online search for companies with an actual website.
Edit: A pressurized unit was mentioned but you need to know the pressure/CFM requirements. I think the pressure units need a larger compressor to operated properly.