Another vote for Metallica and Star Trek. Two great games from two of the best designers in pinball, different enough to keep you interested, and between the two of them you get a "greatest hits" collection of both traditional and modern pinball features. Go for the premiums if you can, but (unlike some other recent titles) the pros don't feel overtly decontented and don't really penalize you in terms of game play (though you'd probably want to install spinners in met).