I’m assuming that you’re running DC and not DCC?
Peco c55 switches are of very good quality and shouldn’t give you any problems with older “pizza cutter” flanges, since they are really a c80 sunken into the sleepers.
Add a ground throw and you’re all set.
I’d also add to Kyle’s comments that Peco’s have a spring that holds the points against the rails when thrown. This is a disadvantage with slow-throw switch machines like Tortoises (the spring fights the Tortoise until enough motion causes the switch to throw), but should be a plust when they are manually thrown.
I use Atlas Code 80 manual switches. After getting them I decided to use caboose Industries ground throws to operate them manually. So I had to remove and discard the Atlas manual mechanisms. If I had known from the start that I would use ground throws, I would have bought Atlas Custom Line switches (which come without mechanisms) and saved a few pennies.
You might also want to look at the thread on this forum entitled “Peco switch machines” in case you haven’t already read it.