My reason for owning so many mics is for research and development - I try to be familiar with, and be able to comment on, some of the more popular mics a lot of people own. And of course I have to find out which ones are good platforms for upgrade and / or re-voicing modifications.
With the exception of the Coles 4038, Neumann U 87, Gomez, MJ Vin-Jet and the LOMO shotgun all of the mics below have been modified.
AKG - Perception 120 & 200; Apex - 215, 205, 460; Audio Technica - AT 2020; Behringer B1, B2-Pro, T-1, T-47, C2; BLUE - Spark, Bluebird, Baby Bottle, Kick Ball; CAD - GXL 1200, CM 127, GXL 3000, M177, M179; Cascade - Gomez, MJ Vin-Jet, M20, Elroy; Chameleon Labs TS-1; Coles - 4038; Electro Voice - RE-20, RE-15, RE-18, Cardinal; KEL - HM7u, HM2D; M-Audio - Pulsar, Nova; Mojave MA-100; LOMO - long shotgun; MXL v67, v69, 4000, 3000, 990, 991, 909, Cr-24, 2003a, v63, 9000, R144, 7000, v87, 960, 190, 603, 67n, v250; Nady - SCM 800, SCM 900, CM 90, TCM 1050; Neumann KM 184, U 87 (early '70s); Oktava - MK-219, 319, 101, 102, 103, 104, 105, ML52, MKL-2500; Reslo - RB ("Beatles ribbon"); RODE - NT1a, NT1000, NT2a, NTK; SE Electronics - SC2200; Sennheiser - MK4; Shure - SM7, SM57; Studio Projects -C1, B1; Stellar - RM3, Stereo Ribbon; Sterling Audio - ST51, ST55, ST79; t.Bone - Retro Bottle, Retro Tube, SC1100, SC300, SC400, SC600, RB100, RB500, RB700.
Assorted "pre-branding applied" Chinese mics from ShuaiYin, Feilo, iSK etc.
My go-to reference standard mics (own or have access to): Neumann - U 47, U 67, U 87, KM 84, KM 184; Coles 4033; RCA 44 & 77; Shure SM7; Electro Voice RE20; Earthworks - QTC30. You'll notice I'm not an AKG C-12 / Elam 251 kind of guy.