I think a Chameleon will cost quite a bit more than 1K.
As for the Whyte carbon - well that's not exactly cheap either and anyway, you would break it.

For the money Crush looks good.
I was going to suggest a Genesis Alpitude but I looked and they're 1.6K
Genesis Abyss? 1.2K with a free helmet from Bikeactive (lets face it, you can always use another helmet)

I would be surprised if you could you buy frames only on bike to work.
Also you need to check if you can add money. My firm do bike to work through Halfords and they said no when I asked that question.
You can buy frames as thats how i got my Meta 5 VIP in the first place. I added the required £100 as it was £1100 when it first came out.
I could get;
Ragley Mmbop £275
Rockshox Revelation £299
Avid juicy 3 Complete set £100
Cane Creek 1.5 Reducer headset £30
Raceface atlas FR Bars £60
Shimano Deora Chainset £50
Shimano Deore Front Mech £20
SLX Shifters £40
Deore Rear Mech £28
SDG Saddle and I Beam post £58
Total £960 ish.
I have wheels and all the other bits i need hiding in my shed.