Quartz is easy to maintain but not heat proof.

Soapstone!

I agree with Blueskysunnday. Soapstone has been used in chemistry labs for ages.

Maybe you need to evaluate the most important aspect. I would rather have stain proof than heat resistant. I always use a trivet or hot mitt to protect my stone. But if heat is important than stainless like industrial kitchens might work too.

Stainless steel.

That would be Corian, since DuPont, its manufacturer, and all engineered stone manufacturers and the trade association of the natural stone industry all require trivet use, essentially making them equally heat resistant.

Organize your priorities. You can't have it all. Unless you are OK with the industrial look of stainless.

Porcelain.

Corian really is an amazing product. See this CORIAN SOLID SURFACE CARE AND MAINTENANCE document.

Quartz is sealed and mixed with materials that eliminate porosity, so it's both harder and more durable than quartzite.

Quartzite hits most of your requirements. the lighter ones won't etch, but they may stain w/deep red products (if not wiped up within a few hours. most sealers will help with that issue) The darker quartzites with a sealer will be fine. Staining isn't an issue to worry about. Quartzite is very hard, a pan left on it should be fine, (although, use a trivet just because!) and their are many beautiful options.

Quartz is pretty good, won't stain, (although it can) wont etch, But, you can't do heat, clean up is easy, but the edges can chip easily. I've chipped mine a few times w/an iron skillet. The edges actually chip very easily (if you save the chip it can be readily repaired w/o too much notice)

Sorry Celery, but it is NOT more durable than quartzite. Quartzite is harder than granite and scores a 7-8 on the MOHS scale. I had granite for 14 yrs and never chipped, cracked, stained or had a mark from a hot pan on that stone. Quartzite will give similar results. My quartz on the otherhand, i've chipped it,

both of these came from removing my iron skillet from the drawer and bringing it upward to the stovetop. never had an issue when I had my granite

have had slight issues w/staining (I had to use a soft cleanser to remove it) and of course I can't put a hot pan on it.

Granite is pretty much like the quartzite option.

corian is fine if you like that look. personally I don't, but others seem to like it.

soapstone

Porcelain tile. Quartz and Corian are plastic products that will end up in a landfill with all the other non-biodegrable plastics.

"Environmentally-Friendly and Recyclable

"Porcelain is made of 100% natural, raw, and clay-based materials. It doesn't contain any harmful chemicals or resins like quartz or other man-made surfaces. Therefore, after years of use, you can easily recycle your old porcelain counters." -- Countertop Specialty

How are you going to recycle a porcelain countertop? Are you going to put it in the recycle bin with the bottles and cans? Chop it up into pieces? Who will do that? Porcelain is not on my city's list of recyclable materials. Realistically, that slab is going to be hauled to the dump along with every other piece of discarded countertop and building material.

Porcelain will at least biodegrade at some point, without polluting anything. Plastic and resin will not.

Granite all the way.

Granite close to bullet proof and I like polished to avoid grease stains .

I’ve always had good luck with the durability of granite, though it is hard to find a not-too-busy slab. I never put hot pans on any surface without a trivet.