Re: What do you have only one of?
I'm a bit OCD when it comes to things and I hate having stuff around that I don't use or absolutely need so I consolidate down to what I'll get the most use out of and unload the rest:
looper: Boomerang III
delay: Boss DD-500. I'm actually selling an excellent condition Maxon AD999 because I've been getting lost in the options of this thing. Both kill the big box EH DMM, but I've also liked others I've owned in the past like the DLS Echotap.
boost: Cornish CC-1. I've gone through quite a few. I had a Radial one, GoudieFX Crystal Boost, countless tubescreamers (Ibanez TS10, MJM Blues Devil, Clay Jones Overdrive), Siegmund Missing Link
distortion: Mesa Flux Five. Game changer for me. Gosh, it replaced an XTS Atomic, Bogner XTC Blue, MXR Double Shot, Analogman KOT V4, Xotic BB, Pro Analog Dual Drive, Pro Analog Power Drive. Only one I miss is a Cornish SS-3, but for what I need a distortion for the Mesa will get more use.
tuner: Sonic Research ST-200. Far and away better than the Peterson Strobostomp 1 and 2 and Boss TU-2 I've owned as well as a Planet Waves I used to use.
buffer: Cornish LD-1. Best buffer ever. Destroyed all of the pedal buffers I've used in the past and even topped the almighty VHT Valvulator.
Stuff I've owned in the past includes trem and I've found that I liked the Red Witch Pentavocal over the Demeter Tremulator. I dug the Pro Analog Supa Quack over the Dunlop Dimebag Crybaby and Teese Joe Walsh sig. wah.