Best thing you can do is play before you buy although that doesn't always work out!.....
I'm lucky enough to have Pinballz up the road from me where I can play about 100 pins or so....
My two favorite pins right now are WPT and NBA Fastbreak, while I have SM and Lotr in the top 10......
Look at people's comments about the pins and forget the overall ratings...they are WORTHLESS..