Bought an Xbox360 at the same time I got my 40" HDTV. Previously only had a Wii and a PS3 on my 21" SDTV. Started up Bioshock, which I hadn't yet played at the time. I was completely blown away, and I loved it.
"Next gen" ended up biting me in the ass, though, since both my Xbox360 and my PS3 eventually went on to break outside of warranty, after two free Xbox repairs, and one paid PS3 repair.