Dell XPS 13. Starts at $799. +$50 to meet the Windows Pro requirement.
I guess you need to go the the i5-5200u to get TPM - but that still falls under your $1000 price ceiling. You are asking for pro level features here. Those tend to cost extra money.
Not really. Even an Atom processor can have a TPM chip. HP Stream 11 Pro has TPM chip with a Celeron.
The XPS requires an i5 to get TPM which is processor and cost overkill for the purposes the laptops will have. Also, I don't think the XPS 13 is available with Windows 8.1 Pro loaded at the factory. That makes it difficult to get them licensed correctly so we can use our 8.1 Pro volume licenses. Pro Packs are janky to use when it isn't just one personal computer you need to upgrade. It wil be extra cost and licensing hassle to upgrade multiple laptops after purchase.
At this point, only the Surface 3 sold through commercial channels with 8.1 Pro will have everything we need except for a non-ideal form factor.
I think in a few months, more clamshell laptops with Cherry Trail or Core M chips may come out and meet all the criteria we want.