You list is all "stone" products. Stone products are natural. The durability is guaranteed with stone. Stain resistant...remove marble and granite from your list. Both can stain and etch and both will do this with "flooring" more than they will with a counter top. Gloss levels all change...but it will take years to do it. All stones have maintenance = homeowner needs to work at keeping stone looking good. Stone = expensive. There is no "benefit" for "reasonable" when working with stone. They all cost plenty of money. Stone is expensive. No way around it. If you want "glossy" that doesn't stain for a "good price" then you have forgotten to mention the BEST option: porcelain tiles. Porcelain will do everything you want for a lower price. Stone is expensive, it can stain (especially "oil" stains) it will "etch" or lose gloss level with certain liquids (acid based liquids will do this) and they all need to be maintained and eventually need repolishing to maintain "gloss". Durable is all you can expect out of stone. The rest of your wish list belongs with porcelain tiles.

It totally depends upon your interior theme. Now a days polished cement floor is in as it gives quite a raw look and you can go for some combination of glass mosaics with it. Else you have so many options readily available in the market.

Hello, You may have to remove them , take them to nearest timber get them planed and then reinstall. after planing you may have to buy few additional pieces to cover up the material lost in planing. Otherwise, If the gaps are not very big you can try filling them with metal paste or wood putty.

wooden tile only gives look of wooden flooring but real wooden flooring feels different on foot. so its personal choice of what you want to experience.