Hi bsheets - I agree, its a difficult one without making meals myself ahead of time.
I don't think I can add too much of value to your great ideas already (Charcoal chicken with salad a stand-by for me), but FWIW:
-Greek yoghurt (snack, not a meal)
-The deli at the supermarket for cold meats and cheese is a take-away alternative for me at lunchtime - and this can be surprisingly filling
-Tin of tuna mixed with Philly cream cheese is remarkably yummy - some cracked black pepper with it
-I haven't tried this but I've heard frozen vegetables, tin of tuna and some water - put it in a blender for a 'meal in a smoothie' (like I said, I haven't actually tried this ... so no flames if you spit it out please )