Reaper is often the correct answer...unless of course you need to stick with
GW for one reason or another.
Their phase cat should work the part of the Kymerae:
http://www.reapermini.com/OnlineStore/tentacle/sku-down/02664#detail/02664_G
At retail, that isn't a huge savings over the
GW Finecast figures, but it is still $4 bucks cheaper for two of them...figure 25-30% discount from various online stores to sweeten the deal.
On the Razorwings - you can buy the birds as singles from the animal companions pack:
http://www.reapermini.com/OnlineStore/bird/sku-down/03456
Less than a dollar each. In order to add the razor to the razorwing, you can either work with the existing sculpts using paint or trim away the feathers and replace with more mechanical looking feathers made from putty or plasticard/brass.