For the record, there were multiple 1st day winners on Dream House, at least 4 I'm sure of and a couple more I am reasonably sure were first day wins. If I recall right, the 6th couple, Susan and Lee Nelson (combination 916) were the 1st to do so on day 1... 8th couple was the 2nd to do it (Dawn and Marty, 786), because when they did Bob noted only one had done so before them. Highest 1-day win was over $100K, Susan and Lee were only $91K and Dawn and Marty were something like $104K. I am going on 28-year-old memories but they are surprisingly clear given how obsessed I was with the show back then!
Useless trivia: it took until the 4th house win to get someone to pick the right combination. First three couples won the 'in a row' way, which I *think* was 7 games initially, then was 5, then 6 during the run.