I'm glad I can help.

I know that sometimes my posts come across as blunt, but a lot of that is trying to get everything out of my head and have my fingers catch up.
To give you more info: First, peanut butter is a great snack. There have been weeks I've been on a pb kick and had it 3x a day.

Don't be afraid of calories if they're packed with nutrition. It's not so much about how many calories (mostly) as how VALUABLE they are.
If it helps, think about calories the way you think about money.

You'd feel terrible if you spent $1000 on a piece of cheap glass, but if you invested $1000 in a high quality diamond, it would be worth it right? Calories are the same. If you "invest" your calories in nutrient rich food, then you know they're calories well spent.
Ok, that said, protein rich foods and snacks:
24 almonds = 1 serving = 160 calories and 6g protein
1 cup of low fat yogurt = 90-110 calories (depending on the brand) and 8 - 20g protein (depending on the brand)
2 pieces of string cheese = 160 calories and 14g protein
2 boiled eggs = 140 calories and 12 g protein
whole grain toast = 110 ish calories and 6 g protein (if you have to have something carby, this is a good idea)
1/2 cup cottage cheese = 100 calories and 12 g protein (honestly I'm willing to spend the calories on full fat cottage cheese becuase I thnk the low fat version tastes like crap, but if you don't mind it, then LF cottage cheese still has the same amount of protein for fewer calories)
edamame - 90 calories and 9 g protein
1/4 cup hummus - 120 calories and 5 g protein (make your own - it's much better and you can control the flavor any way you want)
What I try to do is always combine one of the above with either fruit or veg. So I might have an apple and some string cheese, or some veggies and hummus, or toast with a banana, or boiled eggs with tomato juice (I really love low-sodium V8, but whatever works for you - just watch the sugar content). 1 piece of whole grain toast spread with 1T (1/2 serving) of peanut butter is under 200 calories and something like 14 g protein. That way you get your carby snacky toast, and the goodness of peanut butter.
My latest snack craving is 1/2 a serving of almonds (about 12 or so of them) and 1/4 cup of golden raisins. I have to make sure I get 4 or 5 raisins in the same bite with each almond. I don't know why but lately I've been CRAVING that every afternoon and it makes a good pre-workout snack, having a nice combination of protein and carbs.
I know you said you don't like meat other that beef, but what about fish? Can you eat tuna in water? That's a GREAT source of protein. You can get those foil packs of tuna and mix it with a little mayo or mustard or even Italian dressing and get nearly 25g protein for about 100 calories.
Also, what about chicken breast in a can and making chicken salad? That might get away from the taste/texture of a whole chicken breast and is almost as protein rich as the tuna.
Both are great for lunches.
Oh, oh oh ... cereal. If you absolutely cannot get along w/out cereal, I'd recommend any of the Kashi brand cereals (they're at least not full of artificial ingredients and preservatives and they've got a decent balance of protein and complex carbs). Or oats - instant oatmeal (the plain kind, not the kind with sugar and junk added) is fine, but steel cut oats will provide more fiber and all of the good stuff that helps lower cholesterol.