Hi Jim,
I'm not sure an 8x10 will be large enough. It's been years since I had a Z thus someone else is probably better answering the question, but it seems like I used to use wider paper on my Z3100.
I've used Plantine and been very happy with the results. Spray a coating on for protection and the results are very nice. I tried the Baryta's, and many swear by it, but the gamut difference was very small (almost unnoticeable to my eyes) with the prints I make and I personally preferred the texture and look of Plantine. Also, Plantine was more forgiving in handling as the Baryta's I tried scratched extremely easily. Supposedly this scratching problem has been improved lately, but I have not tried the new ones.
Good luck.
Miles