Simsi - 8:20 pm on Jan 8, 2013 (gmt 0)
I have some experience here with a past tense keyword and it was very successful. However, that was 2008-2009 and from what I have seen recently, keywords in domains are less inclined to assist ranking directly anyway. What does still seem to help is where inbound link text mtches the phrase but even back then, I found that pretty hard to match when I had the past-tense domain.
What I am saying I guess is that I don't think a past-tense domain will have anything more than a small impact on ranking these days. If it were me, I'd be opting for a name that is memorable/brandable these days instead.