Flooring for Garden Level

Currently we’re using the garden level as a lounge / media room. Due to the slope, it’s above grade with sliding doors on one side, and almost completely below grade on the other side. Right now, it feels like a cement floor and is covered with really cheap institutional type carpet. Was wondering on suggestions for replacing the flooring. It is a very high traffic area from outside (muddy grass) in. Was thinking of replacing with a nicer carpet because of comfort factor (also it gets very cold during the winter even with the heat on). Rip up the old stuff, throw down carpet pad and a nice durable but nice carpet? Is this going to be crazy expensive? The space is about 600-700sqft.

Thanks in advance!!!

By CG_ups |