18x18 ceramic tile? DON'T Do it
Get Porcelain like Piscator said
this is your living room, not a seldom used room
go with porcelain, it won't chip as easy or not at all, ceramic will chip,break and fail much earlier than a good porcelain tile
I'd stay away from ceramic tile as well. Porcelain is the way to go and you can get some decent enough stuff at the depot. For my kitchen I went to a local tile showroom where the selection was better. Consider using a underlayment such as Ditra; it's your house after all.