I am so sorry for your loss
I feel your sports pain. K got bumped up to varsity for soccer and they just won their division. State playoffs start Weds, and Jeff and I are out of town with his dad and Stepmom through Sun. If they win tomorrow, they play Sat and we will miss both games.

Hopefully they win both as then we can make the semi's and final.
PP is a tough call but you do save if you pre order, then the trick is to get as many pictures taken as possible to make it worthwhile.
We did both this trip (the session and PP) and I'd probably do it again. While yes, the per pic price is a bit pricey on the PP if you don't get that many shots, in someways its priceless. For me it's usually the only way I get a picture of myself on my own trip! I had really hoped to do better on the PP than we did (in 08 I think we had 10 shots taken so that was $10 per shot lol! BUT they were some killer photos that I wouldn't have had, so still worth it) but we did much better than 10, maybe 30 this trip. LOL.
Yes, you can add the different cards and PP will actually sort them by date, resort, park, etc. You can then go in and edit (add borders, crop, turn to black and white) and create multiple copies or versions of the same thing before you order the CD. The key thing to remember is you only have 30 days prior to the trip to order the CD so it is good to do it right when you get home.
Also a good habit is to take a pic of the back of your PP card in case you lose it and pre-register the one that comes in your mickey mail so you have it from day 1.
If it weren't for the photo session I wouldn't have a Christmas Card photo so I am really glad we did it!