Unless you have several people helping, you've passed into the realm of "way too much to do". If you get into things like ABT's that require prep, and lets say you have 5 different items(abt's, moinks, bacon wrapped shrimp, etc), even if each person eats just one of each item, you're looking at prepping 750 individual pieces. Nobody eats just one as the old saying goes, so plan on starting prep today and finishing around the 3rd.
Just so you'll know, for passed apps, we usually figure on 5-8 pieces per person the first hour, and 2 more for each additional hour.
Definitely do bowls of plate fillers, like ham salad, potato salad, chicken salad, pasta salad, marinated vegetables, etc. Have these on the table when people arrive and give them 15-20 minutes to nibble a bit before you bring out the more labor intensive items, unless you like seeing one person pile on 6 items in one trip.
Do something that can be easily made by the tray or in bulk of some form, or better yet, made by the person eating it.
Try potato skins on a sheet pan with cheese and bacon, brisket, or pulled pork with some sauce as needed. You can make several trays ahead of time and each tray should hold 30+ skins.
Smoked sausage with mustard, and a mustard/pineapple dip, or bbq/pineapple, etc. Just slice the sausage when you're ready to serve it.
The already mentioned smoked meats, either on a tray or already inserted into small rolls awaiting the eater to dress as desired.
Smoked meatballs in sauce. Swedish meatballs. Smokey links in sauce. Smoked fish dip with pita chips and/or crackers. Stuffed mushrooms.
Cheese or sour cream dip with veggies and fruit. You can dress up these dips with chopped sweet cherry peppers.
Artichoke dip smoked in the smoker is very good. A quesa type dip is also very good, with a side of salsa(s). As simple as it sounds, chips and dip are usually favorites at events I do.
You can also do a bunch of things with phyllo or pastry dough from the freezer section. Jelly rolls with pastry dough stuffed with sausage and cheese, peperoni, mushrooms, etc is easy and can be made ahead of time and sliced when needed. Phyllo can be layered with cream cheese, chopped brisket and jalapenos, or any number of other things and baked ahead of time.
A specialty(restaurant) food supplier can provide you with frozen tart shells, that can be filled with almost anything and taste good. They come in cases of 200-400 depending on size, but they make life easy for something like this.
Possible fillings for Tarts/phyllo/pastry include cream cheese/cheddar mix with brisket, shrimp and cocktail sauce, scallops w/bacon and alfredo, smoked chicken with caramelized onions, grilled chicken with buffalo sauce and diced celery. Pretty much anything you already like that can be chopped up and put into a shell or rolled.
The overall point I'm trying to make here is that just the simple act of putting toothpicks into individual meatballs is EXTREMELY time consuming when you have to do it to 150-1000 pieces. Trust me.
If all you have to do is heat and plate, you're not going to have any fun this night. If you have to do much more than heat and plate, nobody else will have fun either, and they'll be hungry.
If I committed to a party for 150 for passed apps, I'd plan for at least 4 skilled people(ie, no supervision required) other than myself to prep and plate the food.
Think through this carefully. Either plated or buffet style, you're going to need a bunch of serving platters and heating space to heat/keep things warm.
Good luck and have fun. Plan it thoroughly and you can do it. Don't plan, and find out why there are so many people that talk about the "one" time they catered a party.