I've found Target Alpha to be a perfect game for parties. As simple as the rulesets are for EMs, most non-players/non-collectors seem uninterested in learning how a game works. I explain the rules, but they just like "hitting things with the ball." With Target Alpha, these types of players get a classic layout, a great art package, head-to-head competition, and drop targets that reset at the beginning of every ball.
If I had the chance, however, I'd own a Lucky Strike, the Italian version of Gold Strike. I'd like to try that game in 5-ball novelty mode. You get a fixed number of balls, like a replay game, but crazy high scoring with the lightbox advance unit.