A guy I know rides a Trek T1 on the street every day (their largest 62 cm frame) and it is all stock except the seatpost (Thomson Elite) and pedals (Road pedals, not sure which ones). With a front brake, he says it weighs 16 lbs total (as weighed at the bike shop he works at).

So, even if the OP were not to change out the pedals and seatpost, he’s probably still looking at only a 16 or 17lb bike. To me, that is “light enough” and I don’t know if it’s worth spending the kind of dough described in previous posts just to make it 2-3 lbs lighter (but that is just me since I don't have that much cash), and in any case the OP specified $1K.

While you could spend a lot of time accumulating light parts for good deals (yes, I know how fun that is), if the OP wants to just plop down $1K and get a light, off-the-shelf, complete bike, is there any out there for $1K or less that is lighter than the Trek T1 at 16lbs?

I'm also asking since I'm thinking about getting one too... the Surly I ride has some light parts, but it's still a tank. Even my road bike (a Trek 2100, which I love), is noticeably lighter than my Surly.