Don't do it. Its like asking smokers what is the best brand to smoke. The pinball hobby is an addictive one. One day you think "Having a pinball would be cool." Then you find yourself justifying spending $180 on a stupid 3 inch tall guy who flashes 3 times a game because it looks cool.
Jurrassic Park is a good game. There are plenty of tips here to help you get it going. I will agree that jumping in on an estate sale game is a little scary. If you have decent mechanical skills you can fix playfield issues easily.
Now when it comes to board work, you will need to find a guy you can trust. This is where it helps having friends that also like pinball.