As has been said many times, if it flies, floats or (ahem) 'engages in sexual activity', rent it, don't buy it!
Had two marriages, and the pressures of (in the first) military life and (the second) airline lifestyle were just too much for the respective wives. Maybe it's something about the personality of pilots that predisposes us to give more attention to the job than we do to our spouses, but it's certainly true that relationships and aviation don't mix well.
Of my colleagues in Virgin, I can think of only a handful that have maintained a marriage from before they joined. And no, it's not necessarily the presence of beautiful hosties that dooms us to failure!