the HCA is a rejection tool usually less than 2 is good, nothing says that 1.1 is better than a 1.7. The stone from bluenile looks nice, but you have a disadvantage of not being able to see any images of the stone, They are more a drop shipper company that actually do not have the stone in house. Keep in mind that you will not have the advantage of the upgrade policy either whereas from WF you get 100% upgrade towards a new stone whether you new stone cost $100 more or $10000 more you get the full value of what you paid towards your upgrade.
The pavilion of the bluenile is 41.0 degree which is probably the max I would look for, a slight variance of the pavilion may change the look of the stone completely