I too got the 70 and have no deisre for the 77, and I know of more than one person who had both and preferred the 70. It's a personal decision, although admittedly *most* people who have tried both do prefer the 77 - but that's like saying you prefer a Lamhorgini to a Ferrari - either way, they are both great.
And yes, this has been discussed before, many, many, many. many times. If the forum search doesn't work because the search terms are too short, you can always use Google with the "site
entaxforums" parameter: "fa77 da70 site
entaxforums.com".