I have had the 850 Sapphire that would still have had it but was offered to upgrade. I loved the 850. The machine is worth the money $1900 if there is nothing wrong with it, don't need a walking foot by the way.
But the real question is can you afford it. My husband had a retirement pension that was taken illegally over by our government. We lost over a 1,000 per month when that happened. 22,000 retires have banded together and we are in our second year in suit. (Independent researchers have found corruption and illegal things I cant mention yet.) But I know it is painful. I would caution you on spending if there are no reserves in the bank. In today economy we have to remember it is important to survive .
If you determine you can afford it, then make sure it has the cd and all the feet it came with. I have a cd ,if you want, it is yours. If you have tried it out make sure you try the freemotion quilting feature, thats why I bought mine. If need be you can sell the elna.