How old are the kids? Sounds yummy, but a little messy depending on their ages. Marinara sauce and preschoolers... no way! Marinara sauce and 8 yr olds.. maybe. If they are little and the party is in your home, I would NOT do a sauced anything!
For my son's 3rd birthday (all the parents stayed), we did a 6' sub, macaroni salad, chips, fruit salad, veggies w/dip, and chicken poppers with dips. It was super easy (ordered it from a gourmet market and it was shockingly cheap) and there was nearly nothing left!
I'm with you, though... sick of pizza too! I think that's why there was nothing left at my son's party- people actually ate!