At $699, I don't see any points why people would choose HD800 over T1. Hd800 is hardly be found around $1200 new and used usually runs around $1000. $300 more than brand new T1. If brand new hd800s go below $890 (happened once on last black Friday), I might consider. At this point there is a no-brainer to wrap a pair of T1.
I totally agree with this. I was one of the lucky few who got that HD800 deal, so trading up (more like a sidegrade, actually) was easy for me. I ended up trading my T1 for a T5p and now I have the best of both worlds.