As a tip that might help in your pricing, they often make bridesmaid dresses in this length and they are usually a lot cheaper - you can get them made in whatever colour you want.
I had a ballerina length dress with a different neckline to the one you want, but it was really beautiful especially from the back, it was a bridesmaids dress that I had made in ivory and it only cost about �200 - that was 12 years ago mind you.
Have a look in the bridesmaids section and keep an open mind - the dress I tried on was navy blue, but I took a chance and it really paid off.