The FT2, I'd probably pay $80-$90 for. $150 is a bit high. Back in the late '90s, that was pretty reasonable. 50/1.4... Depends on the version. But, probably about $90 if truly mint with no fungus anywhere, nor scratches, and minimal dust. 28/3.5, probably closer to $40-$50. Again, depends on the version. 55/3.5, $75 seems reasonable, cosmetically. So, maybe throw an offer of $180 or so out there and see if they'll bite. I suspect they will.
FT2 (and FT3) bodies with properly working meters are kinda scarce, btw. About 80% of the bodies I come across have at least some jumpiness in the meter needle, typically caused by moving the shutter speed ring and not the coupling ring. Whereas, most of the FTn bodies I've owned have been smooth in operation. Even the ones that are so dented that they look like they've melted into a silver/black ball with a lens mount. The meter cells do sometimes go bad. I recommend setting the ASA to 400, then set the lens to f/8 with the lens cap on. Turn the meter on and set the shutter speed to 1/60. It should remain at full underexposure. If the needle centers itself, then at least one cell is bad.
Currently have two FTn bodies. A chrome Nikkormat body that I bought for $10, and a black Nikomat version that I bought for $24. The black body had some cosmetic damage, but worked fine and had new light seals. Replaced the top cover with one from another black FTn. Looks decent now. The chrome body's issue was that the shutter speed indicator strip had come off the pulleys.
-J