Too many.
If only Digital hadn't become prevalent. I'd still be shooting with a black FM and a chrome FM2n. The FM2n is the camera I miss the most. Shot with it from 1991 until 2004 when I bought an F3P and used both bodies, a MD-11, and a beater 55/2.8 as trade fodder for the P. I eventually got the 55/2.8 back, but didn't buy my FM2n back. Probably should've.
I just gave my last Nikkormat to Ralph Javins (a black FT2 that I had overhauled - was the 117th Nikkormat I've owned). Parted out the 35th FM2n (total of 53 FE/FM series bodies) I've owned a couple nights ago. I still have my 12th F2 (out of 23 bodies), a very late model black F2AS that saw Sover Wong, am on my 6th F3P (again, 23 bodies total), and have my 21st F, a late '72 build F FTn with F-36, coming from Toby Fitch on FB. I've also had 24 F4 bodies with a couple of them being parts bodies. 10 F5 bodies, a couple FG bodies, an EM, a N2000 and N2020, two N8008 bodies, and a N90. Pentax-wise, four H3v/SV bodies, three(?) Spotmatics, a Spotmatic II, Spotmatic F parts camera, a ME Super, a Super Program (actually Super A - black version), and possibly something else. I've also had a Maxxum 9000, three Hasselblad 500c bodies (one being an actual c, and the other two being the mismarked transitional c-c/m models), a 500EL that didn't work, and a Canon FTb.
The cameras I regret buying: the 500EL, the latest FM2n (as well as one I bought in late 2005 with warped shutter curtains), some of the Nikkormat bodies that turned out to be crap, and some others that I don't remember.
Regret selling: the aforementioned chrome FM2n, probably my 7768947 serial F2A, the loaded F5 I had in 2011, my original F3P, even though it was the ugliest of the six, and the F4 I wound up trading for the 500EL.
-J