I've had a Vive for about three and a half years which I bought after trying out the Occulus Dk2, my original plan was just to use it seated but I think roomscale is where VR really shines particularly in combination with the motion tracked controllers.
The size of my room sounds similar to yours although I've not mentioned it, the chaperone boundaries kick in quickly but I don't find it spoils the enjoyment for me.
Desktop: A64 3000, 1GB DDR400, Radeon X850XT, Seagate 120GB HD + WD 80GB, Pioneer 105 & 106 DVD Burners
Laptop: Dell Inspiron XPS 2, GeForce 6800go Ultra, 1.2GB DDR2-533 ram, 60GB HD, WUXGA 1920x1200 screen, DVD/CD-RW drive, Intel pro 2200 b/g wireless
"Every person has voices in their heads, whispered doubts and ambitions, dreams and nightmares. How much reality one gives them, how much you allow yourself to be controlled...that only you can decide"